1. Neurogastroenterology Unit, Gastroenterology Department Wythenshawe Hospital, Manchester University NHS Foundation Trust Manchester UK
2. Division of Diabetes, Endocrinology and Gastroenterology University of Manchester Manchester UK
3. Northern Care Alliance NHS Foundation Trust Greater Manchester UK
4. Manchester Academic Health Science Centre, Research and Innovation Manchester University NHS Foundation Trust Manchester UK
5. Centre for Biostatistics, Division of Population Health, Health Services Research and Primary Care University of Manchester Manchester UK