1. Department of Internal Medicine; Yonsei University College of Medicine; Seoul Korea
2. Departments of Internal Medicine; Korea University College of Medicine; Seoul Korea
3. Department of Internal Medicine; Catholic University of Daegu School of Medicine; Daegu Korea
4. Department of Internal Medicine; Chonbuk National University Medical School; Jeonju Korea
5. Department of Internal Medicine; Keimyung University School of Medicine; Daegu Korea
6. Department of Internal Medicine; Inha University School of Medicine; Incheon Korea