1. Clinical Surgery, University of Edinburgh, Royal Infirmary of Edinburgh, Edinburgh, UK
2. Department of Colorectal Surgery, St Mark's Hospital, Northwick Park, Harrow, UK
3. Department of Anaesthesia, McGill University Health Centre, Montreal, Quebec, Canada
4. Department of Gastrointestinal and Hepatopancreatobiliary Surgery, University Hospital of Northern Norway and Institute of Clinical Medicine, University of Tromsø, Tromsø, Norway