1. Department of Internal Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea
2. Department of Internal Medicine, International St. Mary’s Hospital, Incheon, Korea
3. Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan, Korea
4. Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
5. Department of Internal Medicine, Keimyung University School of Medicine, Daegu, Korea
6. Department of Internal Medicine, Pusan National University College of Medicine, Busan, Korea