1. St Bartholomew's Hospital; West Smithfield London UK EC1A 7BE
2. MRC Clinical Trials Unit; Meta-analysis Group; 222 Euston Road London UK CB2 2BW
3. Centre Hospitalier Universitaire; Service de Chirurgie Digestive; Niveau 7 Avenue de Cote de Nacre Caen France 14033 cedex
4. MRC Clinical Trials Unit; Cancer Division; 222 Euston Road 5 Shaftesbury Road London UK NW1 2DA
5. Hospital Pontchaillou; Department of Digestive Surgery; Rue Henri Le Guilloux Rennes France 35033 RENNES
6. Kirurgisk Afdelling; Aker Sygenhus Oslo Norway N-0514
7. Ballesse; Centre Regional Francois; Caen France
8. Hospitalier Regional et Universitaire De Rennes; Centre De Chirurgie Digestive Et Unite of Transplantation; Pontchailier 35033 Rennes Cedfx France
9. University of York; Centre for Reviews and Dissemination; York UK YO10 5DD
10. MRC Clinical Trials Unit; Aviation House 125 Kingsway London UK WC2B 6NH
11. Cancer Hospital; Department of Radiation Oncology; P O Box 2258 Beijing China 100021