1. Oxford Centre for Diabetes, Endocrinology & Metabolism; Churchill Hospital; University of Oxford; Oxford UK
2. Endocrinology & Metabolism Unit; CTO A. Alesini Hospital ASL Roma 2; Department of Systems Medicine; University of Rome Tor Vergata; Rome Italy
3. Oxford Centre for Diabetes, Endocrinology & Metabolism; Churchill Hospital; National Institute for Health Research; Oxford Biomedical Research Centre; University of Oxford; Oxford UK
4. Department of Gastroenterology and Hepatology; Oxford University Hospitals NHS Trust; Oxford UK