1. Department of Oesophagogastric Surgery, Gloucestershire Royal Hospital, Great Western RoadGloucester, GLI 3NN
2. Department of Upper GI Surgery, Worcestershire Royal Hospital, Charles Hastings WayWorcester Worcestershire, WR5 1DD
3. Gloucestershire Cellular Pathology Laboratory, Cheltenham General Hospital, CheltenhamGlos, GL53 7AN