1. Division of Immunology, Boston Children's Hospital, Harvard Medical School, Boston, MA;
2. Division of Immunology and Allergy, University Hospital of Lausanne, Laboratory Center of Epalinges, Lausanne, Switzerland;
3. Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa and Unità Operativa Pediatria 2, Istituto Giannina Gaslini, Genoa, Italy;
4. Division of Rheumatology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA;
5. Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden;
6. Transplantation Institute, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA;
7. Gastrointestinal Unit and Center for the Study of Inflammatory Bowel Diseases, Massachusetts General Hospital, Boston, MA;
8. Gastroenterology Division, Boston Children’s Hospital, Harvard Medical School, Boston, MA;
9. Centre for Immunodeficiency, Section of Molecular and Cellular Immunology, Institute of Child Health and Great Ormond Street Hospital for Children, National Health Service Foundation Trust, London, United Kingdom; and
10. Harvard Stem Cell Institute, Boston, MA