1. Department of Internal Medicine, Pusan National University College of Medicine, Pusan, Korea.
2. Department of Internal Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Internal Medicine, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
7. Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea.
9. Department of Internal Medicine, National Health Insurance Corporation Ilsan Hospital, Goyang, Korea.
10. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea.
11. Department of Internal Medicine, Keimyung University College of Medicine, Daegu, Korea.