1 Leeds Institute of Medical Research at St James's, University of Leeds, Leeds, UK; Leeds Gastroenterology Institute, St James's University Hospital, Leeds, UK.
2 Nuffield Health The Manor Hospital, Oxford, UK.
3 patient representative or caregiver, University of Southampton, Southampton, UK.
4 James Lind Alliance, National Institute for Health and Care Research, School of Healthcare Enterprise and Innovation, University of Southampton, Southampton, UK.
5 Leeds Institute of Medical Research at St James's, University of Leeds, Leeds, UK; Leeds Gastroenterology Institute, St James's University Hospital, Leeds, UK. Electronic address: alexf12399@yahoo.com.