1. Department of Family Medicine, Korea University College of Medicine, 73 Goryeodae-ro Seongbuk-gu, Seoul 02841, Korea
2. Department of Statistics and Actuarial Science, Soongsil University, 369 Sangdo-Ro, Dongjak-Gu, Seoul 06978, Korea
3. Division of Endocrinology and Metabolism, Department of Internal Medicine, The Catholic University of Korea, 222 Banpo-daero Secho-gu, Seoul 06591, Korea
4. Department of Family Medicine, Ulsan University College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29, Saemunan-ro, Jongno-gu, Seoul 03181, Korea