Department of Gastroenterology;
University of Ulsan College of Medicine;
Asan Medical Center;
Division of Gastroenterology;
Department of Internal Medicine;
Center for Health Promotion;
Seoul National University Hospital;
Department of Clinical Epidemiology and Biostatistics;
University of Ulsan College of Medicine;
Asan Medical Center;
Division of Gastroenterology;
Department of Internal Medicine;
Hallym University College of Medicine Hallym University Sacred Heart Hospital;
Department of Gastroenterology;
Seoul National University College of Medicine;
Seoul National University Hospital Gangnam Center;
Inflammatory Bowel Disease Center;
University of Ulsan College of Medicine;
Asan Medical Center;