1. Translational Gastroenterology Unit and Biomedical Research Centre, Nuffield Department of Clinical Medicine, University of Oxford , Oxford , UK
2. Department of Pediatrics, UT Southwestern Medical Center , Dallas TX , USA
3. Institute of Child Health, University College London , London , UK
4. Paediatric Gastroenterology Department, Great Ormond Street Hospital for Children NHS Foundation Trust , London , UK
5. SickKids Inflammatory Bowel Disease Centre, Hospital for Sick Children , Toronto, ON , Canada
6. Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, Kennedy Institute of Rheumatology, University of Oxford , Oxford , UK
7. Primary Immunodeficiency Group, Newcastle University Translational and Clinical Research Institute , Newcastle upon Tyne , UK
8. Department of Pathology and the Eugene McDermott Center for Human Growth and Development. UT Southwestern Medical Center , Dallas, TX , USA
9. German Clinic for Diagnostics [DKD], Helios Klinik , Wiesbaden , Germany
10. Laboratory of Immunology and Cellular Therapy, Great Ormond Street Hospital for Children, NHS Foundation Trust , London , UK
11. Department of Biochemistry, University of Toronto , Toronto, ON , Canada
12. Cell Biology Program, Sick Kids Research Institute, Hospital for Sick Children , Toronto, ON , Canada
13. Department of Pediatrics, University of Toronto , Toronto, ON , Canada
14. Institute of Medical Science, University of Toronto , Toronto, ON , Canada
15. Department of Pediatrics, and Department of Internal Medicine, University of Texas Southwestern Medical Center , Dallas, TX , USA
16. Biomedical Research Centre, University of Oxford , Oxford , UK
17. Department of Paediatrics, John Radcliffe Hospital , Oxford , UK