1. Department of Medicine and
2. Cambridge Institute for Medical Research, University of Cambridge School of Clinical Medicine, Addenbrooke’s Hospital, Cambridge, United Kingdom;
3. Department of Paediatric Gastroenterology, Addenbrooke's Hospital, Cambridge, United Kingdom;
4. Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, United Kingdom;
5. Institute for Molecular Medicine Finland, University of Helsinki, Helsinki, Finland;
6. Program in Medical and Population Genetics and Genetic Analysis Platform, The Broad Institute of the Massachusetts Institute of Technology and Harvard University, Cambridge, MA; and
7. Department of Medical Genetics, University of Helsinki and University Central Hospital, Helsinki, Finland