1. University Hospital of Nancy; Vandoeuvre-les-Nancy; France
2. St Vincent's Hospital; Melbourne; Australia
3. Clinical Research Support Council; Belfast; NI; UK
4. Causeway Hospital; Northern Trust; Antrim; NI; UK
5. Service de Gastroenterologie; Paris; France
6. Department of Hepato-Gastroenterology; Hopital Claude Huriez; Lille Cedex; France