1. Upper GI Unit and Minimally Invasive Unit; Heart of England NHS Foundation Trust; Birmingham UK
2. Department of Pathology; University College Dublin; Dublin Ireland
3. Institute of Metabolism and Systems Research; University of Birmingham; Birmingham UK
4. Department of Diabetes and Endocrinology; Heart of England NHS Foundation Trust; Birmingham UK
5. Centre of Endocrinology Diabetes and Metabolism; Birmingham Health Partners; Birmingham UK