1. Department of Internal Medicine Seoul National University Hospital Seoul Korea
2. Department of Internal Medicine Seoul National University College of Medicine Seoul Korea
3. Department of Preventive Medicine Konkuk University School of Medicine Seoul Korea
4. Department of Medical Statistics, College of Medicine Catholic University of Korea Seoul Korea
5. Department of Internal Medicine Keimyung University School of Medicine Daegu Korea
6. Department of Internal Medicine Seoul National University Boramae Medical Center Seoul Korea
7. Kidney Research Institute Seoul National University College of Medicine Seoul Korea