1. Department of Pediatrics, University of California–San Francisco, San Francisco, California
2. Harvard Medical School, Boston, Massachusetts
3. Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts
4. Division of General Academic Pediatrics, Department of Pediatrics, Massachusetts General Hospital for Children, Boston, Massachusetts
5. Division of Gastroenterology and Nutrition, Department of Pediatrics, Massachusetts General Hospital, Boston, Massachusetts
6. Section of General Pediatrics, Department of Pediatrics, Yale School of Medicine, New Haven, Connecticut