1. Department of Medical and Molecular Genetics, King’s College London, London, UK
2. Wellcome Trust Sanger Institute, Hinxton, Cambridge, UK
3. Department Gastroenterology and Hepatology, St George’s University Hospitals NHS Foundation Trust, London, UK
4. IBD Service, King’s College Hospital NHS Foundation Trust, London, UK
5. Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, UK
6. Department of Gastroenterology, Guy’s and St Thomas’ NHS Foundation Trust, London, UK
7. Sydney Brenner Institute for Molecular Bioscience, University of Witwatersrand, Johannesburg, South Africa