1. Department of Family Medicine, Korea University College of Medicine, Seoul 02841, Korea
2. Department of Medical Statistics, Catholic University College of Medicine, Seoul 06591, Korea
3. Division of Endocrinology and Metabolism, Department of Internal Medicine, The Catholic University of Korea, Seoul 14647, Korea
4. Department of Family Medicine, Center for Obesity, Metabolism, and Nutrition, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang 10326, Korea
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul 03181, Korea