1. School of Medicine, Yale University, New Haven, Conn, USA.
2. Brown University, Rhode Island Hospital, Providence, RI, USA.
3. Uppsala University, Department of Medical Sciences, University Hospital, Uppsala, Sweden.
4. Flinders Medical Centre, Adelaide, SA.
5. University of Melbourne, Peter MacCallum Cancer Centre, Melbourne, VIC.
6. Norwegian University of Science and Technology, Department of Gastroenterology, St Olavs Hospital, Trondheim, Norway.
7. Barts and the London School of Medicine and Dentistry, London, UK.