1 Translational Gastroenterology Unit, John Radcliffe Hospital, Oxford University Hospitals, Headington, Oxford, United Kingdom; NIHR Oxford Biomedical Research Centre, United Kingdom. Electronic address: jan.bornschein@ouh.nhs.uk.
2 Translational Gastroenterology Unit, John Radcliffe Hospital, Oxford University Hospitals, Headington, Oxford, United Kingdom; NIHR Oxford Biomedical Research Centre, United Kingdom.