1. Department of Medical Microbiology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, P.O. Box 30001, 9700 RB Groningen, The Netherlands
2. Institut für Mikrobiologie, Ernst-Moritz-Arndt Universität Greifswald, Friedrich-Ludwig-Jahn-Str. 15, D-17489 Greifswald, Germany
3. DECODON GmbH, Biotechnikum Greifswald, Rathenaustrasse 49a, D-17489 Greifswald, Germany
4. Department of Cell Biology, University Medical Center Groningen, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
5. Department of Gastroenterology and Hepatology, Erasmus Medical Center, Gravendijkwal 230, 3015 CE Rotterdam, The Netherlands