1. Institute of Medical Microbiology, University of Regensburg, Franz Josef Strauss Allee 11, 93053 Regensburg, Germany
2. Institute of Virology, Freie Universität Berlin, Philippstrasse 13, 10115 Berlin, Germany
3. Institute of Virology, Ulm University Hospital, Albert Einstein Allee 11, 89081 Ulm, Germany
4. Department of Statistics, Iowa State University, Ames, Iowa 50011-1210
5. Geneart AG, Josef Engert Strasse 11, 93053 Regensburg, Germany