Affiliation: | 1. Department of Medicine, Seoul National University College of Medicine, Seoul, South Korea;2. Department of Family Medicine, Seoul National University Health Service Center, Seoul, South Korea;3. Department of Family Medicine, Seoul National University Hospital, Seoul, South Korea;4. Department of Colorectal Surgery, Konkuk University Medical Center, Seoul, South Korea;5. Department of Surgery, Konkuk University School of Medicine, Seoul, South Korea |