1 Veterans Health Service Medical Center, Veterans Medical Research Institute, Seoul, Republic of Korea.
2 Department of Applied Statistics, Chung-Ang University, Seoul, Republic of Korea.
3 Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.
4 Department of Healthcare Research Institute, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Republic of Korea.
5 Department of Family Medicine, Seoul National University Hospital Healthcare System Gangnam Center, Seoul National University College of Medicine, Seoul, Republic of Korea.
6 Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea. gohwom@snu.ac.kr.
7 Department of Healthcare Research Institute, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Republic of Korea. gohwom@snu.ac.kr.