1. Division of Pediatric Endocrinology, Mass General for Children and Harvard Medical School, Boston, MA 02114, USA
2. Neuroendocrine Unit, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA
3. Pediatric Program, MGH Weight Center, Massachusetts General Hospital, Boston, MA 02114, USA
4. Biostatistics Center, Massachusetts General Hospital, Boston, MA 02114, USA
5. Department of Radiology, Musculoskeletal Imaging and Interventions, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA