Affiliation: | 1.Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Korea ;2.Department of Applied Statistics, Gachon University, Seongnam-si, Korea ;3.Division of Gastroenterology, Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea ; |