Paul J Rodriguez’s research while affiliated with St. Joseph's Hospital and other places

... 2 Further, TD is often overlooked because the symptoms may be nonspecific, and a number of apparently asymptomatic cases have also been reported. 3,4 Risk factors for TD include alcoholism, hyperemesis gravidarum, anorexia, and heart failure, as well as advanced age and dementia, 1,[5][6][7][8][9] with cancer and depression also reported in recent years. [10][11][12][13][14] It has also been reported that the use of proton pump inhibitors (PPIs) and diuretics may reduce blood thiamine levels. ...

Reference:

The prevalence of thiamine deficiency among elderly nursing home residents: A cross‐sectional study

... Cases such as these suggest that grief often brings about a certain unintelligibility of "moving on", which naturally may, but also may not, involve the experience of painful, paralysing sadness. In his ground-breaking research into "bereavement visits", which dates back to the 1960s, the Welsh physician Dewi Rees has been exploring the phenomenon of bereaved people seeing, meeting, or talking to their lost ones [48]-which he, just as others, strives to describe as a natural and healthy phenomenon helping the bereaved people [48][49][50]; cf. again the discussion of continuous bonds both in [9] and independent of ecological contexts [12] (chap. ...

Reference:

Ecological Grief Observed from a Distance