1. Department of Gastroenterology, St George’s Healthcare NHS Trust St George’s University London UK
2. Institute for Infection and Immunity St George’s University London UK
3. School of Public Health Imperial College London London UK
4. Department of Primary Care and Population Health University College London London UK
5. Department of Clinical Epidemiology Aarhus University Denmark
6. Institute of Psychiatry Psychology & Neuroscience King’s College London London UK
7. South London and Maudsley NHS Foundation Trust London UK