1. Maurice Müller Laboratories (DKF), Universitätsklinik für Viszerale Chirurgie und Medizin Inselspital, University of Bern, Murtenstrasse 35, CH-3010 Bern, Switzerland.
2. Institute for Infectious Diseases, University of Bern, Friedbühlstrasse 51, CH-3010 Bern, Switzerland.
3. Institute of Internal Medicine, Catholic University of Rome, Largo Agostino Gemelli 8, 00168 Rome, Italy.
4. Department of Hepatology and Gastroenterology, Ghent University, De Pintelaan 185, 9000 Ghent, Belgium.
5. Division of Gastroenterology and Hepatology, University Hospital Basel, Petersgraben 4, CH-4031 Basel, Switzerland.
6. Institute of Pathology, University Bern, Murtenstrasse 31, Postfach 62, CH-3010 Bern, Switzerland.