| Affiliation: | 1. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea;2. Department of Internal Medicine, Kangdong Sacred Heart Hospital, Seoul, Korea;3. Graduate School of Public Health, Seoul National University, Seoul, Korea;4. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea;5. Department of Internal Medicine, Asan Medical Center and University of Ulsan College of Medicine, Seoul, Korea;6. Department of Surgery, Seoul National University Boramae Medical Center, Seoul, Korea;7. Department of Surgery, Asan Medical Center and University of Ulsan College of Medicine, Seoul, Korea |
