1. Department of Pediatrics, Division of Endocrinology, University of Tennessee Health Science Center , Memphis, TN 38163 , USA
2. Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Johns Hopkins University School of Medicine , Baltimore, MD 21205 , USA
3. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health , Baltimore, MD 21205 , USA
4. Department of Epidemiology, Colorado School of Public Health, University of Colorado Anschutz Medical Campus , Aurora, CO 80045 , USA
5. Department of Pediatrics, Division of Endocrinology and Diabetes, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania , Philadelphia, PA 19104 , USA
6. Department of Pediatrics, Division of Pediatric Endocrinology and Diabetes, Johns Hopkins University School of Medicine , Baltimore, MD 21287 , USA
7. Department of Medicine, Division of Endocrinology, Diabetes, and Bone Disease, Icahn School of Medicine at Mount Sinai , New York, NY 10001 , USA
8. Department of Pediatric Endocrinology, C.S. Mott Children's Hospital, University of Michigan School of Medicine , Ann Arbor, MI 48109 , USA
9. Massachusetts General Hospital, Department of Medicine-Division of Endocrinology-Neuroendocrine, Department of Pediatrics-Division of Endocrinology, Nutrition Obesity Research Center at Harvard (NORCH) , Boston, MA 02114 , USA