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Huh CW, Son NH, Youn YH, Jung DH, Kim MK, Gong EJ, Huh KC, Kim SY, Park MI, Lee JY, Kwon JG, Kim JH, Shin CM, Jung KW, Hong SJ, Kim HM, Choi SC, Jung HK, Kim HJ, Lee KJ. Real-world Prescription Patterns and Patient Satisfaction Regarding Maintenance Therapy of Gastroesophageal Reflux Disease: An Observational, Cross-sectional, Multicenter Study. J Neurogastroenterol Motil 2023; 29:470-477. [PMID: 37814437 PMCID: PMC10577463 DOI: 10.5056/jnm23088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 08/25/2023] [Accepted: 09/14/2023] [Indexed: 10/11/2023] Open
Abstract
Background/Aims Gastroesophageal reflux disease (GERD) is a common chronic gastrointestinal disorder that typically requires long-term maintenance therapy. However, little is known about patient preferences and satisfaction and real-world prescription patterns regarding maintenance therapy for GERD. Methods This observational, cross-sectional, multicenter study involved patients from 18 referral hospitals in Korea. We surveyed patients who had been prescribed proton pump inhibitors (PPIs) for GERD for at least 90 days with a minimum follow-up duration of 1 year. The main outcome was overall patient satisfaction with different maintenance therapy modalities. Results A total of 197 patients were enrolled. Overall patient satisfaction, patient preferences, and GERD health-related quality of life scores did not significantly differ among the maintenance therapy modality groups. However, the on-demand therapy group experienced a significantly longer disease duration than the continuous therapy group. The continuous therapy group demonstrated a lower level of awareness of potential adverse effects associated with PPIs than the on-demand therapy group but received higher doses of PPIs than the on-demand therapy group. The prescribed doses of PPIs also varied based on the phenotype of GERD, with higher doses prescribed for non-erosive reflux disease than erosive reflux disease. Conclusion Although overall patient satisfaction did not significantly differ among the different PPI maintenance therapy modality groups, awareness of potential adverse effects was significantly different between the on-demand and continuous therapy groups.
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Affiliation(s)
- Cheal Wung Huh
- Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Nak Hoon Son
- Department of Statistics, Keimyung University, Daegu, Korea
| | - Young Hoon Youn
- Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Da Hyun Jung
- Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Min Kyung Kim
- Department of Statistics, Keimyung University, Daegu, Korea
| | - Eun Jeong Gong
- Department of Internal Medicine, College of Medicine, Hallym University, Chuncheon, Gangwon-do, Korea
| | - Kyu Chan Huh
- Division of Gastroenterology, Department of Internal Medicine, College of Medicine, Konyang University, Daejeon, Korea
| | - Seung Young Kim
- Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
| | - Moo In Park
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Ju Yup Lee
- Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
| | - Joong Goo Kwon
- Department of Internal Medicine, Daegu Catholic University School of Medicine, Daegu, Korea
| | - Jae Hak Kim
- Department of Internal Medicine, Dongguk University College of Medicine, Goyang, Gyeonggi-do, Korea
| | - Cheol Min Shin
- Departments of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - Kee Wook Jung
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Su Jin Hong
- Department of Internal Medicine, Soonchunhyang University, Bucheon, Gyeonggi-do, Korea
| | - Hee Man Kim
- Health Promotion, Gangnam Severance Hospital, Seoul, Korea
| | - Suck Chei Choi
- Department of Gastroenterology, Wonkwang University School of Medicine, Iksan, Jeollabuk-do, Korea
| | - Hye-Kyung Jung
- Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea
| | - Hyun Jin Kim
- Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University College of Medicine, Changwon, Gyeongsangnam-do, Korea
| | - Kwang Jae Lee
- Department of Gastroenterology, Ajou University School of Medicine, Suwon, Gyeonggi-do, Korea
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Wang HM, Huang PY, Yang SC, Wu MK, Tai WC, Chen CH, Yao CC, Lu LS, Chuah SK, Lee YC, Liang CM. Correlation between Psychosomatic Assessment, Heart Rate Variability, and Refractory GERD: A Prospective Study in Patients with Acid Reflux Esophagitis. Life (Basel) 2023; 13:1862. [PMID: 37763266 PMCID: PMC10533115 DOI: 10.3390/life13091862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 08/28/2023] [Accepted: 09/01/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND Gastroesophageal reflux disease (GERD) affects a significant proportion of individuals, with life stress being a contributing factor. This study aimed to investigate the correlation between psychosomatic evaluations, heart rate variability (HRV), and GERD in a cohort of individuals. Additionally, the study aimed to analyze the sequencing changes following proton pump inhibitor (PPI) treatment and identify predictive factors associated with refractory GERD. METHODS A prospective cohort of 105 individuals with reflux esophagitis and a control group of 50 participants without acid reflux symptoms were enrolled. Psychosomatic evaluations, including GERDQ, GERDQLQ, RSI, BAI, BDI, and SSS-8, were assessed at baseline and during treatment. HRV parameters were also evaluated. Multivariate analysis was used to identify predictive factors for refractory GERD. PPIs were administered regularly for the initial 2 months and then used on-demand. Refractory GERD was defined as less than 50% improvement in symptom relief or GERDQLQ score ≥ 20 after 8 weeks of PPI treatment. RESULTS The GERD group had higher scores in all psychosomatic evaluations compared to the control group (all p-values < 0.001). There were no significant changes in any parameters of HRV before and after treatment in the GERD group. Strong and consistent correlations were observed between GERD symptoms and psychological scores (BAI, BDI, and SSS-8) across all time points (W0, W4, and W8). Sequential reductions in GERD symptom scores and psychosomatic evaluations were observed during the initial eight weeks of treatment. Higher GERDQ (≥10) and SSS-8 (≥12) scores were predictive of refractory GERD (p = 0.004 and p = 0.009, respectively). CONCLUSIONS This study emphasizes the importance of considering physiological and psychological factors in the management of GERD. Psychosomatic evaluations provide valuable insights for assessing and treating GERD patients. Integrating stress management and comprehensive assessments into personalized treatment strategies is crucial.
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Affiliation(s)
- Hsin-Ming Wang
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Pao-Yuan Huang
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Shih-Cheng Yang
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Ming-Kung Wu
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan;
| | - Wei-Chen Tai
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Chih-Hung Chen
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Chih-Chien Yao
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Lung-Sheng Lu
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Seng-Kee Chuah
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Yu-Chi Lee
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
| | - Chih-Ming Liang
- Division of Hepato-Gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, 123 Ta Pei Road, Niao-Sung Dist., Kaohsiung 833, Taiwan; (H.-M.W.); (P.-Y.H.); (S.-C.Y.); (W.-C.T.); (C.-H.C.); (C.-C.Y.); (L.-S.L.); (S.-K.C.)
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Jung K, Jung HK, Kwon JG, Tae CH, Bang KB, Park JK, Lee JY, Shin CM, Oh JH, Song KH, Lee OY, Choi MG. Development and Validity Assessment of a Self-evaluation Questionnaire for Functional Dyspepsia: A Multicenter Prospective Study in Korea. J Neurogastroenterol Motil 2022; 28:111-120. [PMID: 34980694 PMCID: PMC8748857 DOI: 10.5056/jnm20250] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 12/18/2020] [Accepted: 12/28/2020] [Indexed: 12/12/2022] Open
Abstract
Background/Aims Patient-reported outcomes (PROs) are essential for clinical decision making, conduction of clinical research, and drug application acquisition in functional gastrointestinal disorders. The aim of this study is to develop a PRO instrument and to determine the respondents’ perception of the efficacy of therapeutic agents for functional dyspepsia (FD). Methods A self-evaluation questionnaire for dyspepsia (SEQ-DYSPEPSIA) was developed and validated through a structured process. The 2-week reproducibility was evaluated, and the construct validity was assessed by correlating the scores of SEQ-DYSPEPSIA (including typical and major FD symptom subscales). Finally, the response to medication was assessed by comparing the changes after 4 weeks of treatment. Results A total of 193 Korean patients (age 48.5 ± 13.6 years, 69.4% women) completed the questionnaire. SEQ-DYSPEPSIA with 11 items had a good internal consistency (alpha = 0.770-0.905) and an acceptable test-retest reliability (intraclass correlation coefficient = 0.733-0.859). The self-evaluation questionnaire (SEQ)-major FD score highly correlated with the postprandial fullness/early satiety domain of the Patient Assessment of Gastrointestinal Symptom Severity Index (correlation coefficient r = 0.741, P < 0.001), Nepean Dyspepsia Index-Korean version (NDI-K) (r = 0.839, P < 0.001), and NDI-K quality of life (r = −0.275 to −0.344, P < 0.001). After medical treatment, decrease in the SEQ-typical FD and SEQ-major FD was significantly greater in the responder group than in non-responder group (P = 0.019 and P = 0.009, respectively). Conclusion This study suggests that the Korean version of SEQ-DYSPEPSIA has good reliability and validity, and can be a useful PRO measurement tool in patients with FD.
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Affiliation(s)
- Kyoungwon Jung
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Hye-Kyung Jung
- College of Medicine, Ewha Womans University, Seoul, Korea
| | - Joong Goo Kwon
- Daegu Catholic University School of Medicine, Daegu, Korea
| | - Chung Hyun Tae
- College of Medicine, Ewha Womans University, Seoul, Korea
| | - Ki Bae Bang
- Dankook University College of Medicine, Cheonan, Chungcheongnam-do, Korea
| | - Jong Kyu Park
- Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Gangwon-do, Korea
| | - Ju Yup Lee
- Keimyung University School of Medicine, Daegu, Korea
| | - Cheol Min Shin
- Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea
| | - Jung Hwan Oh
- College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Kyung Ho Song
- CHA University, Ilsan Medical Center, Ilsan, Gyeonggi-do, Korea
| | - Oh Young Lee
- Hanyang University College of Medicine, Seoul, Korea
| | - Myung-Gyu Choi
- College of Medicine, The Catholic University of Korea, Seoul, Korea
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Dorsey YC, Song EJ, Leiman DA. Beyond the Eckardt Score: Patient-Reported Outcomes Measures in Esophageal Disorders. Curr Gastroenterol Rep 2021; 23:29. [PMID: 34850300 DOI: 10.1007/s11894-021-00831-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/24/2021] [Indexed: 12/15/2022]
Abstract
PURPOSE OF REVIEW To provide an overview of patient reported outcome measures (PROMs) and summarize their role in assessing undifferentiated dysphagia and common esophageal disorders, including achalasia, eosinophilic esophagitis (EoE), and gastroesophageal reflux disease (GERD). RECENT FINDINGS Given the subjective nature of swallowing disorders, accurate diagnoses often rely on capturing the patient experience. As a result, the number of PROMs used to characterize esophageal symptoms is increasing with a recent particular emphasis on EoE. Overall, esophageal-focused PROMs are used to interpret patient symptoms and quality of life, diagnosis, and symptom changes over time. There are limitations with each instrument, including factors affecting validity, reliability, accessibility, patient participation, and logistical implementation. PROM instruments can be helpful tools in the diagnosis and treatment of esophageal disorders. Instruments should be chosen based on factors such as target population and setting, including research, clinical, and quality improvement efforts. Future research should address how best to implement PROMs and integrate the obtained data with patient care.
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Affiliation(s)
- Y Claire Dorsey
- Division of Gastroenterology, Duke University School of Medicine, Duke Clinical Research Institute, 200 Morris Street, Durham, NC, 27701, USA
| | - Erin J Song
- Department of Medicine, Duke University, Durham, NC, USA
| | - David A Leiman
- Division of Gastroenterology, Duke University School of Medicine, Duke Clinical Research Institute, 200 Morris Street, Durham, NC, 27701, USA. .,Duke Clinical Research Institute, Durham, NC, USA.
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Yang J, Lee J, Lee H, Lee J, Youn YM, Choi JH, Kim YJ, Kang HS, Han KH, Kim SH, Kang KS. Is the Diagnostic Trial with Proton Pump Inhibitors Reasonable for School Age Children with Gastroesophageal Reflux Symptoms? Pediatr Gastroenterol Hepatol Nutr 2019; 22:511-517. [PMID: 31777716 PMCID: PMC6856512 DOI: 10.5223/pghn.2019.22.6.511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Accepted: 09/30/2019] [Indexed: 12/29/2022] Open
Abstract
PURPOSE On the basis of evidence, we aimed to reevaluate the necessity of the empirical proton pump inhibitor (PPI) trial for children with suspected gastroesophageal reflux disease (GERD). METHODS We analyzed the frequency of GERD in 85 school-age children with gastroesophageal reflux (GER) symptoms, who received 24-hour esophageal pH monitoring and/or upper endoscopy. According to the reflux index (RI), the children were classified into normal (RI <5%), intermediate (5%≤ RI <10%), or abnormal (RI ≥10%) groups. RESULTS Fifty six were female and 29 were male. Their mean age was 12.6±0.5 (±standard deviation) years (range: 6.8-18.6). The RI analysis showed that the normal group included 76 patients (89.4%), the intermediate group included 6 patients (7.1%), and the abnormal group included 3 patients (3.5%). The DeMeester score was 5.93±4.65, 14.68±7.86 and 40.37±12.96 for the normal, intermediate and abnormal group, respectively (p=0.001). The longest reflux time was 5.56±6.00 minutes, 9.53±7.84 minutes, and 19.46±8.35 minutes in the normal, intermediate, and abnormal group, respectively (p=0.031). Endoscopic findings showed reflux esophagitis in 7 patients. On the basis of the Los Angeles Classification of Esophagitis, 5 of these patients were included in group A, 1 patient, in group B and 1 patient, in group C. CONCLUSION The incidence of GERD was very low in school-age children with GER symptoms. Therefore, injudicious diagnostic PPI trials would be postponed until the actual prevalence of GERD is verified in future prospective studies.
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Affiliation(s)
- Jaeeun Yang
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Jieon Lee
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Hyunju Lee
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Juyeon Lee
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Young Mee Youn
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Jae Hong Choi
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Yoon-Joo Kim
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Hyun Sik Kang
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Kyoung Hee Han
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Seung Hyo Kim
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
| | - Ki-Soo Kang
- Department of Pediatrics, Jeju National University School of Medicine, Jeju, Korea
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Seo HS, Choi M, Son SY, Kim MG, Han DS, Lee HH. Evidence-Based Practice Guideline for Surgical Treatment of Gastroesophageal Reflux Disease 2018. J Gastric Cancer 2018; 18:313-327. [PMID: 30607295 PMCID: PMC6310769 DOI: 10.5230/jgc.2018.18.e41] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 12/21/2018] [Accepted: 12/21/2018] [Indexed: 12/13/2022] Open
Abstract
The prevalence of gastroesophageal reflux disease (GERD) is increasing in Korea, and physicians, including surgeons, have been focusing on its treatment. Indeed, in Korea, medical treatment using a proton pump inhibitor is the mainstream treatment for GERD, while awareness of surgical treatment is limited. Accordingly, to promote the understanding of surgical treatment for GERD, the Korean Anti-Reflux Surgery Study Group published the Evidence-Based Practice Guideline for the Surgical Treatment of GERD. The guideline consists of 2 sections: fundamental information such as the definition, symptoms, and diagnostic tools of GERD and a recommendation statement about its surgical treatment. The recommendations presented 5 debates regarding fundoplication: 1) comparison of the effectiveness of medical and surgical treatments, 2) effectiveness of surgical treatment in cases of refractory GERD, 3) effectiveness of surgical treatment of extraesophageal symptoms, 4) comparison of effectiveness between total and partial fundoplication, and 5) effectiveness of fundoplication in cases of hiatal hernia. The present guideline is the first to demonstrate the efficacy of the surgical treatment GERD in Korea.
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Affiliation(s)
- Ho Seok Seo
- Guideline Committee of Korean Anti-Reflux Surgery (KARS) Study Group.,Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Miyoung Choi
- Division of Health Technology Assessment Research, National Evidence-based Healthcare Collaborating Agency, Seoul, Korea
| | - Sang-Yong Son
- Guideline Committee of Korean Anti-Reflux Surgery (KARS) Study Group.,Department of Surgery, Ajou University School of Medicine, Suwon, Korea
| | - Min Gyu Kim
- Guideline Committee of Korean Anti-Reflux Surgery (KARS) Study Group.,Department of Surgery, Hanyang University Guri Hospital, Hanyang University School of Medicine, Seoul, Korea
| | - Dong-Seok Han
- Guideline Committee of Korean Anti-Reflux Surgery (KARS) Study Group.,Department of Surgery, Seoul National University Boramae Hospital, Seoul, Korea
| | - Han Hong Lee
- Guideline Committee of Korean Anti-Reflux Surgery (KARS) Study Group.,Division of Gastrointestinal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
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