1Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
2Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
3Inflammatory Bowel Disease Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
4Digestive Diseases Research Center, University of Ulsan College of Medicine, Seoul, Korea
5Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
6Department of Internal Medicine, Seoul Paik Hospital, Inje University College of Medicine, Seoul, Korea
7Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
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