1. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06355, Republic of Korea
2. Department of Statistics and Actuarial Science, Soongsil University, Seoul 06978, Republic of Korea
3. Department of Medical Statistics, College of Medicine, Catholic University of Korea, Seoul 06591, Republic of Korea
4. Division of Rheumatology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea
5. Department of Medicine, National Police Hospital, Seoul 05715, Republic of Korea
6. Korean Health Insurance Review and Assessment Service, Seoul 06653, Republic of Korea
7. Department of Medical Humanities, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea