1. Department of Endocrinology and Nutrition, Hospital de la Santa Creu i Sant Pau, IIB-Sant Pau , 08041 Barcelona , Spain
2. Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER Unidad 747), ISCIII , 08025 Barcelona , Spain
3. Department of Medicine, University of Vic—Central University of Catalonia , 08500 Vic, Barcelona , Spain
4. Neuroendocrine Unit, Division of Endocrinology, Department of Medicine, Massachusetts General Hospital , 02114 Boston, MA , United States
5. Department of Medicine, Harvard Medical School , 02115 Boston, MA , United States
6. Eating Disorders Clinical and Research Program, Department of Psychiatry, Massachusetts General Hospital , 02114 Boston, MA , United States
7. Translational and Clinical Research Center, Massachusetts General Hospital , 02114 Boston, MA , United States
8. Center for Neurointestinal Health, Division of Gastroenterology, Massachusetts General Hospital , 02114 Boston, MA , United States
9. Eating Disorders Research Unit, Mental Health Services of the Capital Region of Denmark, Psychiatric Centre Ballerup , 2750 Ballerup , Denmark
10. Population, Policy and Practice, Great Ormond Street Institute of Child Health, University College London , WC1N 1EH, London , United Kingdom
11. Division of Pediatric Endocrinology, Massachusetts General Hospital , 02114 Boston, MA , United States