1. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
2. Division of Rheumatology, Department of Internal Medicine, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea
3. Department of Psychiatry, College of Medicine, Jeju National University, Jeju, Korea
4. Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Korea