1 Division of Endocrinology and Metabolism, Department of Internal Medicine, Jeonbuk National University Medical School, Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.
2 Department of Internal Medicine, Dongguk University College of Medicine, Gyeongju, Korea.
3 Division of Endocrinology, Department of Internal Medicine, Nazareth General Hospital, Daegu, Korea.
4 Department of Pathology, University of California San Diego, La Jolla, CA, USA.