1 Department of Biomedical Informatics, Korea University College of Medicine, Seoul, Korea.
2 Biomedical Research Center, Korea University Guro Hospital, Seoul, Korea.
3 Division of Gastroenterology and Hepatology, Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea.
4 Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
5 Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea.
6 Departmenet of Family Medicine, Seoul National University Hospital, Seoul, Korea.