1. Department of Clinical Diabetes, Endocrinology, and Metabolism, City of Hope National Medical Center , Duarte, California 91010 , USA
2. Division of Endocrinology, Department of Medicine, University of Kansas Medical Center , Kansas City, Kansas 66160 , USA
3. Department of Internal Medicine, Bassett Medical Center , Cooperstown, New York 13326 , USA
4. Department of Internal Medicine, National Cheng Kung University Hospital, National Cheng Kung University , Tainan 700, Taiwan
5. Division of Endocrinology, Department of Internal Medicine, Harbor–UCLA Medical Center , Torrance, California 90509 , USA
6. Metabolic Diseases and Endocrinology, The Lundquist Institute , Torrance, California 90509 , USA