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Clinical Rehabilitation
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CLINICAL
REHABILITATION
What is rehabilitation? An
empirical investigation leading
to an evidence-based description
Derick T Wade
Abstract
Background: There is no agreement about or understanding of what rehabilitation is; those who pay for
it, those who provide it, and those who receive it all have different interpretations. Furthermore, within
each group, there will be a variety of opinions. Definitions based on authority or on theory also vary and
do not give a clear description of what someone buying, providing, or receiving rehabilitation can actually
expect.
Method: This editorial extracts information from systematic reviews that find rehabilitation to be
effective, to discover the key features and to develop an empirical definition.
Findings: The evidence shows that rehabilitation may benefit any person with a long-lasting disability,
arising from any cause, may do so at any stage of the illness, at any age, and may be delivered in any setting.
Effective rehabilitation depends on an expert multidisciplinary team, working within the biopsychosocial
model of illness and working collaboratively towards agreed goals. The effective general interventions
include exercise, practice of tasks, education of and self-management by the patient, and psychosocial
support. In addition, a huge range of other interventions may be needed, making rehabilitation an extremely
complex process; specific actions must be tailored to the needs, goals, and wishes of the individual patient,
but the consequences of any action are unpredictable and may not even be those anticipated.
Conclusion: Effective rehabilitation is a person-centred process, with treatment tailored to the individual
patient’s needs and, importantly, personalized monitoring of changes associated with intervention, with
further changes in goals and actions if needed.
Keywords
Rehabilitation description, content, process, therapy, person-centred
Date Received: 15 January 2020; accepted: 18 January 2020
Oxford Institute of Nursing, Midwifery and Allied Health
Research (OxINMAHR) and Movement Science Group,
Faculty of Health and Life Sciences, Oxford Brookes
University, Oxford, UK
Corresponding author:
Derick T Wade, Oxford Institute of Nursing, Midwifery and
Allied Health Research (OxINMAHR) and Movement Science
Group, Faculty of Health and Life Sciences, Oxford Brookes
University, Headington Campus, Gypsy Lane, Oxford OX3
0BP, UK.
Email: derick.wade@ntlworld.com;
Twitter: @derickwaderehab
905112CRE0010.1177/0269215520905112Clinical RehabilitationWade
research-article2020
Editorial
2 Clinical Rehabilitation 00(0)
Introduction
What constitutes rehabilitation? Physiotherapy?
Exercises? Something you receive ‘to get you bet-
ter’? Many healthcare staff, when referring someone
to rehabilitation, have little idea, maybe saying
‘they’ll sort out your problems for you’, or some-
times ‘they’ll work you really hard’. Commissioners,
similarly, rarely understand what they are paying
for; at most they expect a certain number of contact
hours between a patient and a therapist and/or set-
ting goals. Patients do not know what to expect.
Searching dictionaries or the Internet does not
help much because the answers are imprecise and
lack detail. Commissioners (for example) still
would not know what they are paying for, how to
assess its quality, or how to quantify it if depending
on published definitions, such as one in a recent
commissioning guide1 (Box 1), or others.2–4 Most
definitions are not based on evidence.
Box 1.
A definition of rehabilitation
From NHS England’s guide on commissioning rehabilitation1
The goal:
A modern healthcare system must do more than just stop people dying. It needs to equip them [patients] to
live their lives, fulfil their maximum potential and optimise their contribution to family life, their community
and society as a whole.
The content:
Rehabilitation achieves this by focusing on the impact that the health condition, developmental difficulty
or disability has on the person’s life, rather than focusing just on their diagnosis. It involves working in
partnership with the person and those important to them so that they can maximise their potential and
independence, and have choice and control over their own lives. It is a philosophy of care that helps to
ensure people are included in their communities, employment and education rather than being isolated from
the mainstream and pushed through a system with ever-dwindling hopes of leading a fulfilling life.
An empirical investigation into the phenome-
non of rehabilitation might clarify the matter. This
editorial reviews studies reporting that rehabilita-
tion has a beneficial effect and asks: what aspects
of the intervention being studied, rehabilitation, are
common between the various studies investigating
successful rehabilitation?
This approach is not new. It was used to investi-
gate the nature of ‘stroke unit rehabilitation’ in
2002,5 and the 2013 review6 stated:
In summary, organised inpatient (stroke unit) care was
characterised by: (1) co-ordinated multidisciplinary
rehabilitation, (2) staff with a specialist interest in
stroke or rehabilitation, (3) routine involvement of
carers in the rehabilitation process and (4) regular
programmes of education and training.
This editorial, based on systematic reviews and
larger individual trials, identifies the features of
rehabilitation found in studies showing that patients
benefit. Its aim is to discover the main characteris-
tics of effective ‘rehabilitation’. The results are
presented in three domains:
Context: who may benefit, and does location
matter?
Process: what are the common features of the
process?
Interventions: what interventions are used?
It develops an evidence-based description of
effective rehabilitation.
Context
This part investigates whether the benefits of reha-
bilitation are restricted to specific patient groups,
or to delivery in specific locations.
Wade 3
What conditions are associated with
benefit?
Systematic reviews have considered rehabilitation
involving patients covering a large range of condi-
tions, diseases, and ages, and in almost all groups a
positive effect is shown. Patients can be helped by
rehabilitation if they have the following:
Pulmonary and respiratory conditions;7–9
Cardiac10,11 conditions;
Neurological conditions such as multiple scle-
rosis,12–14 stroke,6 motor neurone disease,15 and
other conditions;16,17
Musculo-skeletal disorders such as fractures,18,19
hip and knee arthroplasty,20 and sub-acute or
chronic back pain;21,22
Malignancies.23,24
The common feature among the wide variety of
disease disorders listed above is that the patient has
a continuing disability, often with several or many
factors contributing to the situation.
The only reasonable conclusion must be that
rehabilitation, whatever it is, is likely to benefit
anyone with persistent disability associated with an
illness, regardless of the underlying disease or
disorder.
Is rehabilitation effective anywhere?
Rehabilitation has been found effective in most
settings:
Probably in intensive care units (there are many
reviews, with contrasting findings);25–28
Specialist rehabilitation inpatient wards;6
Out-patient and day-hospital settings;29,30
Nursing homes;31 and
At home.32–34
It is specifically important to note that reha-
bilitation out of hospital, after discharge, is
effective.32,35
Although the strength of the evidence varies,
there seems little doubt that rehabilitation can have
a beneficial effect wherever it is delivered. Direct
comparisons between different settings have rarely
been studied.
Does stage or prognosis of disease affect
effectiveness?
Categorization of disabling disorders by progno-
sis and stage is difficult, and the categories sug-
gested are not as distinct as they appear. Moreover,
the effects of development (in children) and aging
(in older adults) lead to changes in disability and/
or rehabilitation needs. Nonetheless, there is evi-
dence that rehabilitation is beneficial in the
following:
The acute phase of sudden onset disorders;
stroke,6 acute episodes of coronary artery dis-
ease,10 hip fracture,18 and traumatic brain injury;16
including those where there is no ‘natural
recovery’, such as spinal cord injury where
rehabilitation has transformed life expec-
tancy and social functioning.36,37
The later, more stable phases of acute onset dis-
orders: stroke;38
Diseases that have a slow or fluctuant onset and
are progressive to a greater or lesser degree:
multiple sclerosis,12–14 osteoarthritis,39 chronic
back pain;21
Diseases that are more inexorably progres-
sive: Parkinson’s disease17 and Alzheimer’s
disease.40,41
One may conclude that rehabilitation is likely to
be beneficial to a person with disability at any stage
of their illness and whatever the nature of their
prognosis, including when receiving palliative care:
rehabilitation can benefit people with advanced
cancer.42
Does age limit effectiveness?
There are few trials of rehabilitation (in contrast to
trials on specific interventions) involving children,
and no reviews were identified. The studies
already referred to have included people of all
ages from teenagers through to the very old and
frail. There is no reason to doubt that rehabilitation
4 Clinical Rehabilitation 00(0)
is effective at any age, though there is little evi-
dence for children.
Process
The second part of this review investigates what
features of the process are common across the stud-
ies showing benefit.
Using the biopsychosocial model of
illness
The use of a biopsychosocial framework43 is men-
tioned or implied in almost all reviews and articles.
This characteristic is inextricably intertwined with
multidisciplinary teamwork44 because any process
based on the biopsychosocial model necessarily
considers a wide range of factors, requiring input
from several different professions. Conversely, any
team covering the range of factors in the model
necessarily uses a single framework for analysis
and communication.
The use of this model43 is perhaps the defining
characteristic of rehabilitation and distinguishes
it from most other medical specialist services.
Other healthcare services using the biopsychoso-
cial model, to a greater or lesser extent, are psy-
chiatry, including learning disability and liaison
psychiatry services; palliative care; chronic pain
services; geriatrics; and probably community
paediatrics.
Practicing multidisciplinary teamwork
In almost all the studies and reviews of rehabilita-
tion, the involvement of a multidisciplinary team44
is mentioned explicitly or, if not, it is implied. The
important features associated with multidiscipli-
nary teamwork are also expanded upon in the
stroke rehabilitation reviews.5,6
The need for and characteristics of multidisci-
plinary teams has been reviewed recently.44 Studies
suggest that, in healthcare, teamwork is generally
associated with a better outcome,45 and an observa-
tional study on stroke rehabilitation teams46 found
a relationship between better outcome and three
team features:
Being oriented towards achieving tasks;
Extent of order and organization;
Use of good-quality information.
Another study on stroke rehabilitation teams47
found that effectiveness improved as the quality
of team meetings improved in terms of the
following:
Communication;
Coordination;
Contributions being equal;
Mutual support;
Commitment of members to team goals;
Cohesion (team spirit).
The evidence thus strongly suggests that suc-
cessful rehabilitation depends upon a multidiscipli-
nary team being involved. It is important to stress
that a team is not just a collection of people who
happen to be working with a specific patient; a
team works together with each other over time and
with many patients.44
It is also important to recognize that the team
must have specialist expertise (knowledge and
skills) in the problems that they see. In the case of
stroke unit rehabilitation, this was related to
stroke,5,6 but in other setting, it might be a condi-
tion, such as chronic pain or spinal cord injury, or a
particular intervention such as assistive technol-
ogy, or some other particular aspect of rehabilita-
tion. Acquiring and maintaining specialist expertise
requires continuing multidisciplinary education
and training (i.e. training in areas outside each per-
son’s limited professional field).5,6
Other important characteristics associated with
effective teamwork44 include the following:
Having regular team meetings, both
About individual patients, and
About team functioning and processes.
Using the setting of goals to:
Motivate the patient and team members.
Ensure co-ordination of actions between
different people and over time.
Working collaboratively to
Support each other’s interventions.
Wade 5
Share information, including specific knowl-
edge and skills.
Using structured protocols
Just as the evolution of the biomedical model of ill-
ness led to a very standardized way of approaching
the biomedical aspects of illness, with great suc-
cess, so a structured careful, almost obsessional
approach arising from considering all factors within
the biopsychosocial model of illness is an important
aspect of rehabilitation’s success. The team’s use of
structured approaches to common problems, be that
assessing a person’s losses and abilities, or reacting
to challenging behaviours, or communicating and
reporting on clinical matters is part of the ‘coordi-
nated approach’ identified in stroke services.5
The effectiveness of structured protocols is
perhaps illustrated most powerfully in the field of
spinal cord injury rehabilitation.36,37 Between
1935 and 1955, the prognosis for someone with a
spinal cord injury was transformed from an early
death, secondary to sepsis and renal failure, to
returning to community living and employment
with a reasonable (but not yet fully normal) life
expectancy. This arose in the absence of any treat-
ment for the injury or transformative medical
advance relating to the ‘complications’ that killed
people. Using structured protocols may also
account for the reduced mortality associated with
stroke unit care.6
Being person-centred (and family-
centred)
Two characteristics of successful stroke rehabilita-
tion were ‘routine involvement of carers in the
rehabilitation process’,6 and routine provision of
‘information on stroke disease, rehabilitation, and
recovery’ to both the patient and the family.5 Being
person-centred is also consistent with both goal-
setting and shared decision-making, both processes
that are widely advocated although perhaps lacking
the evidence needed to make a strong case for
them.48–50
There is a close overlap between being person-
centred and rehabilitation. Before discuss it further,
we need to consider two groups of interventions,
those which:
Are effective and applicable across the major-
ity of rehabilitation services;
Are specific to certain conditions.
Interventions – 1
The interventions mentioned most often in reviews
are exercise, education, the giving of information,
and providing psychosocial support. For example, in
cardiac rehabilitation, a recent review identified five
core components of an effective programme.51
Three of the components are applicable to almost all
conditions – exercise training, psychosocial man-
agement, and patient education. Two could be con-
sidered more specific to cardiac disease, nutritional
counselling and risk factor modification, but alterna-
tively they could be considered specific aspects of
patient education. One study suggested psychoso-
cial support was an essential part of respiratory reha-
bilitation,52 but there is little further evidence as to
the meaning or content of ‘psychosocial support’.
Exercise and education will be discussed further.
Exercise
Exercise, as used in rehabilitation research, carries
two meanings. The first concerns undertaking mus-
cular, physical activities that are associated with
increased energy consumption and cardio-respira-
tory work. The second concerns the performance
of a specified activity, usually practicing it to
improve performance. Often the two will coincide,
with undertaking the task-related practice of walk-
ing being a good example.
The benefits of ‘exercise’ as reported in studies
may therefore arise from:
Practicing a functional activity, by repeatedly
performing it, and
Undertaking more muscular work, increasing
cardio-respiratory work.
There is strong evidence supporting task-ori-
ented and task-specific training after stroke,53 with
6 Clinical Rehabilitation 00(0)
the majority of the benefit being found in improved
performance of the specific task. There is probably
a dose–response relationship,54,55 but in practice,
the extra amount of direct therapy time needed to
make a difference is too large to be feasible.56 The
practice of the activity, rather than direct therapy
input, is probably the main factor leading to bene-
fit. The general principle of task-oriented training
(i.e. practicing a functional activity) applies across
all rehabilitation, because it is a principle underly-
ing learning.
There is also reasonable evidence supporting the
benefits associated with exercise that increases car-
dio-respiratory work. The benefits not only include
better cardio-respiratory function,8–11 but extend
well beyond cardio-respiratory fitness.10,11,39,57
Exercise may help patients with chronic fatigue,58
low back pain,59 osteoarthritis of hip or knee,39
ankle sprains,60 cardiac problems,10 chronic obstruc-
tive pulmonary disease,8 and many more condi-
tions, often ‘with or without education and/or
psychological support’.8
Education and self-management
The specific effect of education is not often studied
separately. One review suggested education
improved quality of life in people with cardiac
disease.61
However, self-management by a patient with a
long-term disabling condition depends on educa-
tion, and there is evidence to support teaching self-
management strategies for:
Chronic obstructive pulmonary disease,62
improving quality of life, reducing hospital
admissions, but possibly increasing mortality;63
Stroke, improving quality of life;64
Fatigue in people with fatigue associated with
cancer and its treatment.65,66
The common components of successful com-
munity-based programmes67 are also mostly
achieved through education about:
The disease, and management of symptoms
and medication;
Core self-management skills;
Exercise programme;
Self-relaxation training.
In summary, there is good evidence that practic-
ing functional activities and undertaking cardio-
respiratory exercise are both important interventions
in any rehabilitation service. Education is also an
important intervention, although its content is less
well established; it probably always includes
knowledge about the disease; its causes, prognosis,
and treatments; and teaching skills in relation to
self-management. Education may also cover man-
aging the emotional aspects of the illness. Teaching
about prognosis will, importantly, ensure that
the expectations of the patient and family are
appropriate.
Interventions – 2
The range of actions undertaken by a rehabilita-
tion service is dramatically illustrated by the
detailed description of the content of a rehabilita-
tion programme to be undertaken in intensive
care units, being evaluated in a trial. No fewer
than 12 separate components were identified.68
Descriptions of other evaluated rehabilitation
programmes illustrate the number and variety of
actions that constitute a part of the patient’s over-
all rehabilitation.69,70
Thus rehabilitation is definitely a complex inter-
vention, one in which cause–effect relationships
are difficult to establish, are often non-linear, and
often interact (not always beneficially). Table 1
illustrates its complexity of rehabilitation as
assessed using one set of characteristics used to
measure the spectrum of complexity.71
An interesting example of the difficulty in
defining the ‘active ingredient’ comes from a trial
of adding week-end therapy to an inpatient pro-
gramme.72 The trial found a small benefit which, at
first glance, might be attributed to the extra hour of
therapy. However, the associated qualitative
study73 found that ‘The patient-therapist interac-
tion was more important to the patient than the
amount or content of their physiotherapy’. More
importantly, they reported that ‘Saturday therapy
Wade 7
changed patients’ perceptions of weekends in reha-
bilitation’, so that patients in the experimental
group practised more on Sundays too! The effec-
tiveness was probably secondary to a change in the
patient’s perception and expectation (of rehabilita-
tion), not giving extra time.
The complexity of rehabilitation leads to a dif-
ficulty faced by both service providers and com-
missioners. There are very many potential actions
that might benefit a patient, but often there is either
no evidence available about their effectiveness, or
the available evidence is weak or unsupportive.
When evidence of benefit is weak, inconclu-
sive or even negative, it does not necessarily mean
that the intervention should not be used (unless
harm has been demonstrated). First, it may be that
a small number of patients respond well, with the
rest being unaffected, such that benefit cannot be
detected. Second, the intervention may only help
as one component of a bundle of care. Bundles of
Table 1. Complexity of rehabilitation, based on Wells etal.71
n Complexity characteristic Interventions in rehabilitation
1 Number of components within it Multiple components, both in processes and in actions undertaken
2 Its quantity and/or intensity Depends entirely upon the patient’s specific situation and
problem(s); no ‘standard’ dose of any component
3 Ability to specify the components The component processes need to identify and then solve
problems defined, but the actions needed cannot be specified at
the start of rehabilitation
4 Confidence in identification of its
active component
In almost every case, it is impossible to be even partially certain
about the active component, and it is likely that one action
influences several factors within the individual patient’s situation
5 Timing of actions involved Multiple actions over time, with interdependence and often also
dependent upon a correct sequence
6 Number of people involved in its
delivery
Usually large, sometimes very large
7 Extent to which responsibility for
intervention can be delineated
Low ability to delineate responsibility, and team members and
others often share responsibility for actions and goals
8 Number of different (professional)
groups involved
Large number of different professional groups involved, often
coming from outside the ‘core team’
9 Technical/professional skill involved Depends upon specialist knowledge and skills in initial assessment
and analysis, in practical treatment processes and in broader
psychological and communication spheres
10 Extent of human interaction needed
to deliver it
Almost totally dependent on human interaction; interpersonal
relationships with the patient, family members, and other involved
professionals are all crucial
11 Number of settings and organizations
involved
May be delivered in many settings consecutively or together
and will almost always involve working across geographic and
organizational boundaries
12 Degree of patient involvement and
participation needed
Patient engagement is essential at all times, with the exception of
patients who are unconscious
13 Sphere of impact of the actions The processes and the effects of actions both involve many
people surrounding the patient
14 Ability to define and measure main
outcome(s)
Many important outcomes are difficult to define precisely, and
most are only measurable through patient report. E.g. Quality of
life, life satisfaction, social integration. The patient’s own goals
may not be measurable
8 Clinical Rehabilitation 00(0)
care are common, such as those for reducing
infection74 or errors in surgery.75 Often the indi-
vidual components in a bundle have not been
tested separately.
Conundrum and solution
There is, therefore, a conundrum. Rehabilitation as
a process is beneficial. Some interventions that are
common to all fields of rehabilitation have been
identified. But the evidence base for specific inter-
ventions in any particular group of patients is weak
or absent, with few exceptions.
To resolve this conundrum, the rehabilitation
team must, for each patient::
1. Use a collection of interventions to meet the
patient’s specific needs, taking into account all
aspects of his or her situation, wishes, values,
and so on;
2. Evaluate the patient’s rehabilitation programme
on a planned, ongoing basis using simple tar-
geted measures at appropriate intervals.
That rehabilitation should be so specific to the
patient follows from the trite but vital observation
that every patient is different. In the context of a sin-
gle drug or an operation set within a biomedical
model, these differences may not matter. In rehabili-
tation, which is set within the biopsychosocial model,
it is inevitable that many, if not, most actions need
tailoring to a patient’s situation. Therefore, no two
patients will have exactly the same rehabilitation
package, and no two patients will respond in exactly
the same, predictable way. Consequently, when eval-
uating rehabilitation, each patient needs a tailored
package of assessments to evaluate and alter the
package, the timing of these assessments also being
appropriate to the situation. The process should use a
few simple measures only, often to include checking
for harm (e.g. sedation from a drug used).
One term used to encompass this approach is
person-centred care. This phrase has many mean-
ings. Two reviews illustrate what the phrase
encompasses.
One review76 focused on the values and attitudes
associated with person-centred care, suggesting it
requires an organizational culture with six
characteristics:
Respecting the patient’s perspective;
Being compassionate;
Recognizing the importance of interpersonal
relationships both within the patient’s social
groups and also between the rehabilitation
team and the patient;
Prioritizing a patient’s participation in social
and/or meaningful activities;
Recognizing the patient’s role as a citizen; and
Focusing on a patients strengths and abilities.
A second paper77 focused on the necessary pro-
cesses, identifying eight characteristics:
An individualized set of goals derived from the
patient’s preferences;
Ongoing review of the goals and planned
actions;
Use of an interprofessional team (to include the
patient);
Identification of a key-worker as a single point
of contact;
Coordination between all people and organiza-
tions involved;
Good communication and sharing of infor-
mation;
Education and training of both healthcare staff
and the patient and family; and
Performance measurement and quality-control
using feedback from patients.
The similarities between rehabilitation and
person-centred care is obvious, and there is also
evidence that care described as person-centred is
effective,78,79 but not always.80,81
Finally, this person-centred approach has
already been recognized in one definition of reha-
bilitation, adopted by the American Thoracic
Society (ATS) and the European Respiratory
Society (ERS)4 in 2013:
Pulmonary rehabilitation is a comprehensive
intervention based on a thorough patient assessment
followed by patient-tailored therapies that include,
but are not limited to, exercise training, education,
Wade 9
and behavior change, designed to improve the
physical and psychological condition of people
with chronic respiratory disease and to promote the
long-term adherence to health-enhancing behaviors.
Conclusion
A definition of rehabilitation derived from the evi-
dence reviewed is given in Box 2, and Figure 1 out-
lines the process of rehabilitation that follows from
it. The important features that characterize effec-
tive rehabilitation are as follows:
Basing the process on the biopsychosocial
model of illness;
Having an expert multidisciplinary team, which
uses structured protocols to ensure a consistent,
comprehensive approach.
Undertaking a comprehensive (holistic) initial
(diagnostic) assessment to achieve a full under-
standing of the patient’s situation, both the fac-
tors that influence it and the factors that may
determine interventions;
Using many different interventions tailored to
the particular patient;
Monitoring the changes arising in association
with these interventions, evaluating them
against goals, and checking for potential harms.
Commissioners, organizations responsible for
the quality of a rehabilitation service provided,
and patients considering a rehabilitation service
now have an evidence-based set of criteria to
measure the quality of a service (See also supple-
mentary figure).
Box 2.
An evidence-based description of effective rehabilitation
The goal.
To optimize a patient’s self-rated quality of life and degree of social integration through optimizing independence
in activities, minimizing pain and distress, and optimizing the ability to adapt and respond to changes in
circumstances.
Patients and places:
Rehabilitation may
Benefit anyone with a long-term disabling illness at any stage of that illness;
Be delivered in any setting.
The content.
Rehabilitation:
Is a problem-solving process, framed in the context of the holistic biopsychosocial model of illness,
delivered in a person-centred way, and requiring:
○ An expert, multidisciplinary team, setting collaborative team-based goals;
○ A formulation of the situation, covering all domains of the biopsychosocial model;
○ Close, collaborative working across all boundaries, professional, organizational, and geographic;
○ Ongoing monitoring of change and effects of interventions.
Will almost always use the following general approaches to management
○ Repeated practice of functional activities;
○ General exercise that increases cardio-respiratory work;
○ Education with an emphasis upon self-management;
○ Psycho-social support (not well defined yet).
and always involves a large number of specific actions tailored to the patient’s priorities and specific
needs and goals,
○ Covering (if necessary) all domains of the biopsychosocial model of illness;
○ Being evaluated regularly for their benefits and harms, to determine whether they should be continued,
changed, or abandoned.
10 Clinical Rehabilitation 00(0)
Declaration of Conflicting Interests
The author(s) declared no potential conflicts of interest
with respect to the research, authorship, and/or publica-
tion of this article.
Funding
The author(s) received no financial support for the
research, authorship, and/or publication of this article.
ORCID iD
Derick T Wade https://orcid.org/0000-0002-1188
-8442
Supplemental Material
Supplemental material for this article is available online.
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