1. Healthcare System Gangnam Center, Department of Family Medicine, Seoul National University Hospital, Seoul, Republic of Korea
2. Department of Family Medicine and Supportive Care Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
3. Department of Clinical Research Design and Evaluation, Samsung Advanced Institute for Health Science & Technology (SAIHST), Sungkyunkwan University, Seoul, Republic of Korea
4. Department of Statistics and Actuarial Science, Soongsil University, Seoul, Republic of Korea
5. Department of Medical Statistics, The Catholic University of Korea, Seoul, Republic of Korea
6. Healthcare System Gangnam Center, Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
7. Department of Obstetrics and Gynecology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea