1. Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, South Korea
2. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, South Korea
3. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
4. Department of Internal Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, College of Medicine, Seoul, South Korea
5. Department of Internal Medicine, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
6. Department of Internal Medicine, Busan Paik Hospital, Inje University College of Medicine, Busan, South Korea
7. Department of Internal Medicine, Bong Seng Memorial Hospital, Busan, South Korea
8. Department of Surgery, Ajou University Hospital, Ajou University School of Medicine, Suwon, South Korea
9. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea