1. Department of Gastroenterology & Hepatology and Tytgat Institute for Liver and Intestinal Research, Academic Medical Center, University of Amsterdam, 1105 BK Amsterdam, The Netherlands.
2. Genethon, 91000 Evry, France.
3. Department of Pharmaceutical Gene Modulation, Groningen Research Institute for Pharmacy, University of Groningen, 9713 AV Groningen, The Netherlands.