1. Department of Internal Medicine; Seoul National University College of Medicine; Seoul Korea
2. Department of Internal Medicine; Gyeongsang National University Hospital; Jinju Korea
3. Department of Surgery; Seoul National University Boramae Medical Center; Seoul Korea
4. Department of Surgery; Seoul National University College of Medicine; Seoul Korea
5. Department of Internal Medicine; Seoul National University Boramae Medical Center; Seoul Korea
6. Department of Internal Medicine; Seoul National University Bundang Hospital; Seongnam-si Korea