1. Division of Endocrinology and Metabolism; Department of Internal Medicine; Yonsei University College of Medicine; Seoul, Korea
2. Institute of Endocrine Research; Yonsei University College of Medicine; Seoul, Korea
3. Brain Korea 21 PLUS Project for Medical Science; Yonsei University College of Medicine; Seoul, Korea
4. Department of Clinical Nursing Science; Yonsei University College of Nursing; Seoul, Korea
5. Nursing Policy and Research Institute; Biobehavioral Research Center; Yonsei University; Seoul, Korea
6. Department of Pharmacology; Yonsei University College of Medicine; Seoul, Korea
7. Department of Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul, Korea
8. Samsung Advanced Institute for Health Sciences and Technology; Sungkyunkwan University School of Medicine; Seoul, Korea
9. Department of Nuclear Medicine; Yonsei University College of Medicine; Seoul, Korea
10. Division of Endocrinology, Diabetes, and Metabolism; Department of Medicine; Beth Israel Deaconess Medical Center and Harvard Medical School; Boston, MA USA