1. Department of Internal Medicine, Division of Endocrinology and Metabolism, Research Institute of Clinical Medicine of Chonbuk National University-chonbuk National University Hospital, Jeonju, South Korea
2. Department of Internal Medicine, Division of Endocrinology and Metabolism, Seoul National University Bundang Hospital, Seongnam, South Korea
3. Department of Anatomy, Chonbuk National University Medical School, Jeonju, South Korea