Suk-Woo Yang

Catholic University of Korea, Sŏul, Seoul, South Korea

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Publications (49)63.78 Total impact

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    ABSTRACT: Orbital fibroblasts have been reported to be an important effector cells for the development of thyroid-associated ophthalmopathy (TAO). Orbital fibroblasts secrete various inflammatory cytokines in response to an inflammatory stimulation, leading to TAO-related tissue swelling. It has also been reported that (-)-epigallocatechin-3-gallate (EGCG), a major polyphenolic constituent of green tea, has antioxidant and anti-inflammatory properties. In the current study, we investigated the issue of whether or how EGCG affects the interleukin (IL)-1β-induced secretion of IL-8 in human orbital fibroblasts from TAO patients. Treatment with EGCG significantly reduced the level of IL-1β-induced secretion of IL-8 and the expression of IL-8 mRNA. IL-1β-induced the degradation of IκBα, and the phosphorylation of p38 and ERK, and the IL-1β-induced expression of IL-8 mRNA was inhibited by specific inhibitors, such as BAY-117085 for NF-kB, SB203580 for p38, and PD98059 for ERK. In addition, treatment with EGCG inhibited the IL-1β-induced degradation of IκBα, and the phosphorylation of p38 and ERK. However, pre-treatment with antioxidants, NVN and NAC, which suppressed ROS generation, did not reduce IL-8 expression in IL-1β-treated orbital fibroblasts, suggesting that the IL-1β-induced IL-8 expression is not mediated by the generation of ROS. These results show that EGCG suppresses the IL-1β-induced expression of IL-8 through inhibition of the NF-κB, p38, and ERK pathways. These findings could contribute to the development of new types of EGCG-containing pharmacological agents for use in the treatment of TAO.
    No preview · Article · Feb 2016 · PLoS ONE
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    ABSTRACT: Objective: We report on the surgical outcome of endoscopic dacryocystorhinostomy (DCR) and analyze factors that influence surgical failure. Design: Retrospective observational cases series. Participants: A total of 1083 cases who underwent endoscopic DCR with bicanalicular lacrimal stent insertion, performed by 1 surgeon between January 2007 and February 2013. Methods: A retrospective chart review of 1083 cases who underwent endoscopic DCR with bicanalicular lacrimal stent insertion was performed, focusing on factors that were expected to affect the surgical outcomes. Surgical outcomes were recorded as the resolution of symptoms and endoscopic evidence of ostium patency postoperatively. Results: The overall success rate of DCR was 92.7% (1004 cases). Of 79 cases with unsuccessful outcomes, the visualization of anatomical obstruction with endoscopy was possible in 68 cases (86%), whereas no anatomic evidence of obstruction was found in 11 cases (14%). In total, 64 cases underwent additional lacrimal intervention, and 12 cases underwent revision surgery twice after the initial DCR operation. Radioactive iodine ablation was associated with surgery failure by logistic regression analysis. However, other factors, such as sex, age, the presence of earlier accidental tube removal, indications for surgery, and Guardix injection, did not show statistically significant differences. Conclusions: Endoscopic DCR is a surgical technique that has a predictable, favourable success rate. It could be considered appropriate for the initial treatment of nasolacrimal duct obstruction.
    No preview · Article · Dec 2015 · Canadian Journal of Ophthalmology
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    ABSTRACT: The Korea National Health and Nutrition Examination Survey (KNHANES) is a national program designed to assess the health and nutritional status of the noninstitutionalized population of South Korea. The KNHANES was initiated in 1998 and has been conducted annually since 2007. Starting in the latter half of 2008, ophthalmologic examinations were included in the survey in order to investigate the prevalence and risk factors of common eye diseases such as visual impairment, refractive errors, strabismus, blepharoptosis, cataract, pterygium, diabetic retinopathy, age-related macular degeneration, glaucoma, dry eye disease, and color vision deficiency. The measurements included in the ophthalmic questionnaire and examination methods were modified in the KNHANES IV, V, and VI. In this article, we provide detailed information about the methodology of the ophthalmic examinations in KNHANES in order to aid in further investigations related to major eye diseases in South Korea.
    Preview · Article · Nov 2015 · Korean Journal of Ophthalmology
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    ABSTRACT: Purpose We present clinical results of the use of the multipurpose conical porous synthetic orbital implant (MCOI) in surgical procedures of evisceration, enucleation, and secondary enucleation in ophthalmology patients. Methods A retrospective review was performed of 59 eyes in which conical implants were used, including 36 cases of eviscerations, 11 enucleations, and 9 secondary enucleations. In all of the cases, the follow-up period was greater than six months between 2004 and 2013. The results focus on documenting surgical findings, as well as postoperative complications among patients. Results Superior sulcus deformities were found in six eyes (10.2% of conical implant patients), and two eyes received additional surgical interventions to correct the deformities (3.4%). Blepharoptosis was found in four eyes (6.8%), two of which received upper eyelid blepharoplasty (3.4%). Fornix shortening was reported in only one eye (1.7%). Forty-one eyes had a satisfactory cosmetic appearance after the final prosthetic fitting of conical implants (69.5%). The most frequent postoperative complication was orbital implant exposure, which seemed to occur when the preoperative status of the conjunctiva, Tenon's capsule, and sclera preservation were poor in the eyes of the patients. Conclusions There was a lower incidence of blepharoptosis and fornix shortening with the MCOI in comparison to spherical implants, while the incidence of orbital implant exposure was similar with the MCOI in comparison to other types of orbital implants. In addition, the MCOI may have advantages with respect to postoperative cosmetic outcomes.
    Preview · Article · Sep 2015 · Korean Journal of Ophthalmology
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    Su Ah Kim · Su Kyung Jung · Ji Sun Paik · Suk-Woo Yang
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    ABSTRACT: Objective: To evaluate changes in corneal astigmatism in patients undergoing orbital decompression surgery. Methods: This retrospective, non randomized comparative study involved 42 eyes from 21 patients with thyroid ophthalmopathy who underwent orbital decompression surgery between September 2011 and September 2014. The 42 eyes were divided into three groups: control (9 eyes), two-wall decompression (25 eyes), and three-wall decompression (8 eyes). The control group was defined as the contralateral eyes of nine patients who underwent orbital decompression surgery in only one eye. Corneal topography (Orbscan II), Hertel exophthalmometry, and intraocular pressure were measured at 1 month before and 3 months after surgery. Corneal topographic parameters analyzed were total astigmatism (TA), steepest axis (SA), central corneal thickness (CCT), and anterior chamber depth (ACD). Results: Exophthalmometry values and intraocular pressure decreased significantly after the decompression surgery. The change (absolute value (|x|) of the difference) in astigmatism at the 3 mm zone was significantly different between the decompression group and the controls (p = 0.025). There was also a significant change in the steepest axis at the 3 mm zone between the decompression group and the controls (p = 0.033). An analysis of relevant changes in astigmatism showed that there was a dominant tendency for incyclotorsion of the steepest axis in eyes that underwent decompression surgery. Using Astig PLOT, the mean surgically induced astigmatism (SIA) was 0.21±0.88 D with an axis of 46±22°, suggesting that decompression surgery did change the corneal shape and induced incyclotorsion of the steepest axis. Conclusions: There was a significant change in corneal astigmatism after orbital decompression surgery and this change was sufficient to affect the optical function of the cornea. Surgeons and patients should be aware of these changes.
    Preview · Article · Sep 2015 · PLoS ONE
  • Su Kyung Jung · Suk-Woo Yang · Man Soo Kim · Eun Chul Kim

    No preview · Article · Aug 2015 · Canadian Journal of Ophthalmology
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    ABSTRACT: To examine obesity parameters as potential risk factors associated with blepharoptosis in a representative Korean population. We analyzed the Korea National Health and Nutrition Examination Survey (KNHANES), conducted between 2008 and 2010. 10,285 Korean adults (4,441 men and 5,844 women) aged 40 years or older was enrolled. We compared body mass index (BMI), waist circumference (WC) and percentage body fat (BF), according to the severity of blepharoptosis. Multiple logistic regression analysis was conducted to examine the associations of each obesity parameter with blepharoptosis. The overall prevalence of age-related blepharoptosis was 14.8 % in South Korea. There were significant and graded associations between increasing blepharoptosis severity and the mean value of obesity parameters (P for trend < 0.05). As marginal reflex distance 1 (MRD1) decreased, the prevalence of general obesity and overweight status increased (P for trend=0.121 in men and < 0.001 in women); the prevalence of abdominal obesity increased (P for trend < 0.001 for both genders); the prevalence of highest quartile of percentage BF increased (P for trend ≤0.001 for both genders). Blepharoptosis was significantly associated with general obesity in women (adjusted odds ratio (aOR), 2.14; 95% confidence intervals (CI), 1.32-3.47); and with the highest quartile of percentage BF in men (aOR, 2.01; 95% CI, 1.34-2.97) and in women (aOR, 1.52; 95% CI, 1.06-2.3317, after adjusting for age, smoking exercise, drinking alcohol, total energy intake, fat intake, total cholesterol, and high density lipoprotein cholesterol, diabetes, hypertension, and family history of eye disease. The etiology of age-related blepharoptosis may be multifactorial and is unclear. Our results suggest that obesity parameters such as BMI, WC and percentage BF might be potential risk factors for age-related blepharoptosis in a representative Korean population.
    Full-text · Article · Jul 2015 · PLoS ONE
  • Su Kyung Jung · Min Ji Kang · Ji Sun Paik · Suk-Woo Yang

    No preview · Article · Aug 2014 · Journal of Craniofacial Surgery
  • Soo Whan Kim · Suk-Woo Yang

    No preview · Article · Feb 2014 · Journal of Allergy and Clinical Immunology
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    ABSTRACT: To elucidate risk potentiality of frontline radiotherapy associated cataracts in primary ocular adnexal mucosa-associated lymphoid tissue lymphoma (OAML). Data from eight consecutive patients of 41 total OAML patients who had undergone cataract surgery after frontline radiotherapy were analyzed. The median patient age was 46 years (range, 36 to 69 years). The median total radiation dose was 3,780 cGy (range, 3,060 to 4,500 cGy), and the mean duration from radiation irradiation to cataract surgery was 36.60 ± 8.93 months. Preoperative lens opacification was primarily at the posterior lens subcapsule, and best-corrected visual acuity (BCVA) was 0.43 ± 0.21. Patients underwent the phacoemulsification surgical procedure with posterior chamber intraocular lens insertion. The average BCVA improved to 0.90 ± 0.14 after cataract surgery. Two patients underwent posterior continuous curvilinear capsulorhexis, and one had posterior capsule rupture. For posterior capsule opacification (PCO), three patients received Nd:YAG laser posterior capsulotomy after the initial surgery, and one patient is currently under consideration for laser posterior capsulotomy. Radiotherapy increased posterior subcapsule opacification at a relatively young age in primary OAML. Phacoemulsification was a manageable procedure without severe complications, and final visual outcomes were good. However, because after-cataracts progressed earlier than did senile cataracts, close follow-up should be considered for PCO management.
    Preview · Article · Aug 2013 · Korean Journal of Ophthalmology
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    Ji-Sun Paik · Won-Kyung Cho · Gyeong-Sin Park · Suk-Woo Yang
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    ABSTRACT: We report two cases of unilateral upper eyelid swelling with multiple small lumps as an unusual complication of autogenous fat injection for cosmetic forehead augmentation. Two female patients were referred to our clinic for unusual unilateral eyelid swelling, with multiple small lumps. The duration of symptoms differed in each case, but both patients had a history of autogenous fat injection for cosmetic forehead augmentation at a local plastic surgery clinic. The lumps were small (diameter 5 mm~10 mm), palpable, hard, and nonmobile, and were evaluated by magnetic resonance imaging (MRI). Lumps from the eyelids of two patients were excised under general anesthesia. All of the masses were located deeply and found near the superior orbital rim or lateral orbital rim. The lumps exhibited chronic inflammation with fibrosis. Some of the lumps showed foamy histiocytic aggregation and foreign body lipogranuloma, resulting from iatrogenic fat injection. After excision, all masses and swelling disappeared, and moderate ptotic eyelid or lagophthalmos of affected eyes also improved. To our knowledge, eyelid swelling with multiple lumps in the eyelid is a very rare complication of autogenous fat injection for cosmetic forehead augmentation. This report should be helpful for ophthalmic clinicians who encounter these unusual symptoms.
    Preview · Article · Jul 2013 · BMC Ophthalmology
  • Ye Jin Ahn · Su Kyung Jung · Ji Sun Paik · Suk-Woo Yang
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    ABSTRACT: We report a case of lacrimal gland fistula formation after cosmetic lateral canthoplasty in a young Asian woman. A 34-year-old woman, who twice underwent lateral canthoplasties of both eyes with additional upper eyelid blepharoplasty, developed clear fluid discharge from a small draining tract near the lateral canthus after being operated on with cosmetic lateral canthoplasty. Assuming that lacrimal gland fistula has developed, we differentiated the tract from the lacrimal gland using a Bowman probe and performed lacrimal gland fistulectomy, which resolved the discharge, leaving no complications. To our knowledge, this is the first case of lacrimal gland fistula after cosmetic lateral canthoplasty, and surgeons performing this procedure should be aware of lacrimal gland herniation and fistula tract formation, especially in patients who have undergone multiple eyelid surgeries.
    No preview · Article · Jul 2013 · The Journal of craniofacial surgery
  • Su-Kyung Jung · Ji-Sun Paik · Uk-Hyun Sonn · Suk-Woo Yang
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    ABSTRACT: Purpose: We report the surgical outcomes of acellular human dermal allografts for repair of large conjunctiva defects in primary or secondary orbital implant insertion. Methods: This retrospective chart review examined 12 eyes in 12 patients who underwent primary or secondary orbital implant insertion using Medpor® and acellular human dermal allografts to decrease conjunctival tension. Only patients with at least 6 months follow-up were included. The procedure was successful if there was no exposure until the last eye-clinic visit and the patient could wear a prosthesis. It failed if additional surgery was needed to correct the orbital implant exposure. Results: The mean follow-up was 24.5 (range 6-54) months. Seven patients had primary orbital implant insertion, and five had secondary orbital implant insertion with acellular human dermal allografts. All enrolled patients had successful outcomes without exposure of the central conjunctiva. Two underwent additional surgery to correct fornix contracture and regain a cosmetically good prosthesis. Of these, one patient received additional acellular human dermal grafts and had a fair outcome. The other patient ultimately required fornix reconstruction with an autologous graft using oral mucosa. Conclusion: Orbital implant insertion with acellular human dermis grafts had good surgical outcomes. The procedure could be effective for patients with insufficient conjunctival tissue to cover an orbital implant and a high probability of developing orbital implant exposure if tension was created by excessive direct conjunctival closure.
    No preview · Article · May 2013 · Albrecht von Graæes Archiv für Ophthalmologie
  • Eun Sun Jung · Suk-Woo Yang · Ji-Hong Kim · Soo Whan Kim
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    ABSTRACT: Sinonasal type hemangiopericytomas are very rare tumors, and are often called glomangiopericytoma. They are believed to be derived from perivascular modified smooth muscle cells. Their origin is similar to glomus tumors but some distinct differences exist. Glomangiopericytomas are indolent tumors and overall survival rates are higher after complete surgical excision. Recurrence rates are as high as 30%. We present a case of glomangiopericytoma which involves the orbital wall, noteworthy because such bone-dissolving glomangiopericytomas are extremely rare.
    No preview · Article · Apr 2013 · Ear, nose, & throat journal
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    ABSTRACT: The purpose of this study was to evaluate the surgical outcome of the endoscopic dacryocystorhinostomy (DCR) without thermal tools such as cautery, drill and illuminator. The study is a retrospective analysis of patients in a tertiary care unit for oculoplastic surgery. The participants enrolled into the study are a retrospective series of 127 consecutive endonasal DCRs performed between January 2008 and March 2011. The surgical procedure in this conventional endoscopic transnasal DCR involved a manual osteotomy of the frontal process of the maxilla and removal of the lacrimal bone by punch without illuminator, cauterization and drill. We evaluated the result of the manual Endo-DCR technique without cauterization or drilling-assisted technique. Data of 127 eyes were reviewed. Full success was achieved in 90.5 % (115/127) of manual Endo-DCR technique with an average follow-up period of 6 months. Our study appears to show favorable results compared to other previously published outcomes including Endo-DCR surgery with thermal equipments. No thermal tool methods in endonasal DCR can achieve a good surgical success rate. Therefore, the newest tools, cauterization, drilling or illumination, are generally not necessary for endoscopic dacrycystorhinostomy.
    No preview · Article · Feb 2013 · Archives of Oto-Rhino-Laryngology
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    ABSTRACT: Fibroepithelial polyp (FEP) is a benign tumor of mesodermal origin, composed of varying amounts of stroma covered by epithelium. The skin and the genitourinary tract are the most common sites of FEP. Uncommon locations of FEP include the inferior turbinate of the nasal cavity, bronchi, and the pharynx. To date, there has been no report of orbital FEP. The authors describe a patient with congenital orbital FEP arising from the lateral canthal area. This congenital FEP was completely excised successfully through an anterior orbitotomy without any complications, with no evidence of recurrence after 25 months.
    No preview · Article · Jan 2013 · Ophthalmic plastic and reconstructive surgery
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    ABSTRACT: Purpose: To investigate the effects of rapamycin on the TNF-α-induced secretion of interleukin-6 (IL-6) and IL-8 in orbital fibroblasts and its possible mechanism. Materials and methods: Orbital fibroblasts were obtained from patients with thyroid-associated ophthalmopathy. IL-6 and IL-8 levels were measured by enzyme-linked immunosorbent assays. The down-regulation of PDCD4 was performed by PDCD4 siRNA transfection. Results: Rapamycin significantly enhanced TNF-α-induced IL-6 and IL-8 secretion from orbital fibroblasts. Down-regulation of PDCD4 by PDCD4 siRNA transfection reduced TNF-α-induced IL-6 and IL-8 secretion from orbital fibroblasts. In addition, TNF-α was found to promote the mTOR-dependent proteasome-mediated degradation of PDCD4. Rapamycin increased PDCD4 expression via the inhibition of TNF-α-induced PDCD4 degradation in orbital fibroblasts. Conclusion: Rapamycin enhances the TNF-α-induced secretion of IL-6 and IL-8 by suppressing PDCD4 degradation in orbital fibroblasts.
    No preview · Article · Jan 2013 · Current eye research
  • Ji-Sun Paik · Hae-Young Park · Won-Kyung Cho · Suk-Woo Yang
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    ABSTRACT: Aims: Our objective was to evaluate the effects of secondary porous orbital implantation 10 years after the primary evisceration in anophthalmic patients. Patients and methods: This study is a retrospective case series. Secondary orbital implant insertion was performed for 25 anophthalmic patients (25 eyes) who had experienced primary evisceration more than 10 years earlier. Under general anesthesia, secondary enucleation removing the contracted sclera, including the optic nerve, was performed, and diverse types of porous orbital implants were inserted. After surgery, changes in the socket and ocular prosthesis motility, and improvements in esthetic appearance were evaluated. Results: For 24 of the 25 eyes, the patients were satisfied. In 17 eyes, ocular motility was higher than "fair" and showed improvement. Deep superior sulcus deformity was improved to "good" in 8 eyes, and enophthalmos was improved to "fair" in 15 eyes. Combined procedures to correct lid malposition and fornix contracture were successful, and these additional operations to correct the prolonged complications of anophthalmos might have reduced the frequency of implant exposure. Conclusions: In older anophthalmic patients with considerable concomitant socket contracture and cosmetic concerns, secondary porous orbital implant insertion may improve esthetics and the motility of the ocular prosthesis.
    No preview · Article · Nov 2012 · The Journal of craniofacial surgery
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    ABSTRACT: Purpose: To examine the relative positions of the lacrimal fossa (LF) and the bony nasolacrimal canal (BNLC) in relation to each other and a reference plane. Methods: Forty-two orbits and BNLCs from 21 Asian cadavers (9 men and 12 women; average age at death, 84.4 years; range, 70-99 years) had been fixed in 10% buffered formalin before use. After exposing the LF and the medial half of the BNLC, the authors measured the angles of the longitudinal axis of the LF and the BNLC relative to the aesthetic horizontal plane respectively. Based on these values, the relative orientation of the LF and the BNLC was determined and defined in terms of Δ BNLC-LF. A positive Δ BNLC-LF represents a nasolacrimal canal that descends posteriorly relative to the LF. Results: The mean LF, BNLC, and Δ BNLC-LF were 9.5°, 19.8°, and 10.3°, respectively. In 39 passages (92.9%), the Δ BNLC-LF was positive, representing a nasolacrimal canal that is more posteriorly oriented than the LF. In 3 passages (7.1%), the Δ BNLC-LF was equal to or less than 0°; 2 of them (4.8%) had a straight course and 1 passage (2.4%) had a negative value. Conclusions: In most patients, the BNLC is directed more posteriorly than the LF. This finding may help in preventing an inadvertent false passage during probing and intubation in patients with epiphora.
    No preview · Article · Oct 2012 · Ophthalmic plastic and reconstructive surgery
  • Ji-Sun Paik · Won-Kyung Cho · Suk-Woo Yang
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    ABSTRACT: Backgound: To compare differences in endoscopic revision after previously failed lacrimal surgery that involved either external or endoscopic dacryocystorhinostomy. Design: Retrospective, comparative, nonrandomized clinical study. Participants: We assessed 77 patients (82 surgeries) treated for recurrent nasolacrimal duct obstruction. Methods: Electronic medical records for patients with recurrent epiphora who underwent endoscopic revisional dacryocystorhinostomy, after previous external or endoscopic dacryocystorhinostomy at Seoul St. Mary's Hospital from 2004 to 2010, were reviewed. Main Outcome Measures: Data regarding the lacrimal drainage system, comprehensive eye examination, surgical outcome and preoperative/perioperative transnasal endoscopy were analysed. Results: In total, 77 patients underwent 82 endoscopic revisional dacryocystorhinostomy procedures. A success rate of 84% was achieved for cases of previous external dacryocystorhinostomy and 80.7% for previous endoscopic dacryocystorhinostomy (P = 0.722). For preoperative nasal endoscopy, more of the patients who underwent previous external dacryocystorhinostomy exhibited a hypertrophic middle turbinate and severe septal deviation when compared with patients who underwent previous endoscopic dacryocystorhinostomy (P = 0.031, P = 0.001, respectively). For perioperative nasal endoscopy, more of the patients who underwent previous endoscopic DCR exhibited a smaller ostium when compared with patients who underwent previous external dacryocystorhinostomy (P = 0.031). Conclusions: The success rate of revisional dacryocystorhinostomy in the previous external dacryocystorhinostomy group was slightly higher than that in the previous endoscopic dacryocystorhinostomy group. Differences in preoperative and perioperative endoscopic findings were detected between the groups. Clarifying these differences in endoscopic revision will help improve the surgical outcomes of primary surgery involving either external or endoscopic dacryocystorhinostomy.
    No preview · Article · Jul 2012 · Clinical and Experimental Ophthalmology

Publication Stats

226 Citations
63.78 Total Impact Points


  • 2006-2015
    • Catholic University of Korea
      • • College of Medicine
      • • Department of Ophthalmology
      Sŏul, Seoul, South Korea
  • 2014
    • Asan Medical Center
      • Childhood Asthma Atopy Center
      Sŏul, Seoul, South Korea
  • 2013
    • University of Seoul
      Sŏul, Seoul, South Korea