1. Department of Pediatrics, Vanderbilt University Medical Center, Nashville, TN, USA
2. Department of Pediatrics, Mayo Clinic, Rochester, MN, USA
3. Department of Pediatrics, Boston Children’s Hospital, Boston, MA, USA
4. Department of Pediatrics, Connecticut Children’s Medical Center, Hartford, CT, USA
5. Department of Pediatrics, Nationwide Children’s Hospital, Columbus, OH, USA
6. Department of Pediatrics, Children’s Mercy Hospital, Kansas City, MO, USA
7. Department of Pediatrics, Pediatric Specialists of Virginia, Fairfax, VA, USA
8. Department of Pediatrics, University of Utah Department of Pediatrics, Salt Lake City, UT, USA
9. Department of Pediatrics, MassGeneral Hospital for Children, Boston, MA, USA
10. Baylor College of Medicine, Texas Children’s Hospital, USDA Children’s Nutrition and Research Center, Houston, TX, USA
11. Department of Pediatrics, Department of Pediatrics, Children’s Hospital of Philadelphia, Philadelphia, PA, USA
12. Department of Pediatrics, Weill Cornell Medicine, New York, NY, USA
13. Children’s Center for Digestive Healthcare at Children’s Healthcare of Atlanta, Atlanta, GA, USA
14. Department of Pediatrics, University of Southern California Children’s Hospital of Los Angeles, Los Angeles, CA, USA
15. Johns Hopkins University School of Medicine, Johns Hopkins Children’s Center, Baltimore, MD, USA
16. Department of Pediatrics, University of Chicago, Comer Children’s Hospital, Chicago, IL, USA
17. Department of Pediatrics, Seattle Children’s Hospital and the University of Washington, Seattle, WA, USA
18. Department of Pediatrics, Medical College of Wisconsin and Children’s Wisconsin, Milwaukee, WI, USA
19. Department of Pediatrics, Children’s Hospital Colorado, Aurora, CO, USA