1. Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
2. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea
5. Department of Medical Statistics, College of Medicine, The Catholic University of Korea, Seoul, Korea
6. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea
7. Department of Preventive Medicine, Konkuk University School of Medicine, Seoul, Korea