1. Robarts Research Institute; Robarts Clinical Trials; P.O. Box 5015 100 Perth Drive London Ontario Canada N6A 5K8
2. Gibson Laboratories (2nd Floor); Gastroenterology Unit; Radcliffe Infirmary Woodstock Road OXFORD UK OX2 6HE
3. Herlev University Hospital; Department of Medical Gastroenterology C; 75 Herlev Ringvej DK-2730 Herlev Copenhagen Denmark
4. Schwerpunkte Gastroenterologie, Hepatologie und Endokrinologie; Abteilung fur Innere Medizin 1; Robert Bosch Krankenhaus Postfach 501120, Auerbachstr. 110 70341 Stuttgart Germany