1. From the Department of Genetics (A.K., L.C., M.J.B., S.S., C.W., A.Z., J.F.), University of Groningen, University Medical Center Groningen, the Netherlands
2. Department of Internal Medicine and Radboud Center for Infectious Diseases (I.C.L.v.d.M., K.S., J.H.W.R., N.P.R., J.d.G., M.O., L.A.B.J., T.B., M.G.N.), Radboud University Medical Center, Nijmegen, the Netherlands
3. Department of Pediatrics (L.C., D.P.Y.K., F.K., M.H.H., J.F.), University of Groningen, University Medical Center Groningen, the Netherlands
4. Department of Radiology and Nuclear Medicine (M.v.d.G.), Radboud University Medical Center, Nijmegen, the Netherlands
5. Department of Laboratory Medicine (M.v.F., F.K.), University of Groningen, University Medical Center Groningen, the Netherlands
6. Section of Molecular Epidemiology, Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, the Netherlands (P.E.S.)
7. Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston (R.J.X.)
8. Broad Institute of MIT and Harvard, Cambridge, MA (R.J.X.)
9. Gastrointestinal Unit and Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Harvard Medical School, Boston (R.J.X.)
10. Center for Microbiome Informatics and Therapeutics, Massachusetts Institute of Technology, Cambridge (R.J.X.)
11. Department of Immunology, K.G. Jebsen Coeliac Disease Research Centre, University of Oslo, Norway (C.W.)
12. Department for Genomics and Immunoregulation, Life and Medical Sciences Institute, University of Bonn, Germany (M.G.N.)
13. Human Genomics Laboratory, Craiova University of Medicine and Pharmacy, Romania (M.G.N.).