1. Department of General Surgery, St George’s Hospital , London , UK
2. Department of Medicine and Health Sciences, University of Nottingham , Nottingham , UK
3. Department of General Surgery, Norfolk & Norwich University Hospital NHS Trust , Norwich , UK
4. Department of General Surgery, Blackpool Teaching Hospitals NHS Foundation Trust , Blackpool , UK
5. Department of General Surgery, East Suffolk & North Essex Foundation Trust , Colchester , UK
6. Department of General Surgery, Barts Health NHS Trust , London , UK
7. Department of Colorectal Surgery, Bradford Teaching Hospital , Bradford , UK
8. Maternity Department, University Hospitals of Derby and Burton , Darby , UK
9. Department Anaesthesia, Leicester Royal Infirmary, University Hospitals of Leicester , Leicester , UK
10. Department of Anaesthetics and Pain Management, Royal Victoria Infirmary, Newcastle upon Tyne Hospitals , Newcastle upon Tyne , UK
11. Department of Bariatric Surgery, Sunderland Royal Hospital , Sunderland , UK