1. Department of Hepatobiliary Surgery, Royal Free Hospital, Pond Street, London NW3 2QG, UK
2. Department of Paediatrics, Eastbourne District General Hospital, Eastbourne BN21 2UD, UK
3. Department of Transplantation, Leicester General Hospital, Leicester LE5 4PW, UK
4. Department of General Surgery, St Helier Hospital, Carshalton SM5 1AA, UK