1. Institute of Physiology II; University of Münster; 48149 Münster Germany
2. Institute of Biophysics; Johannes Kepler Universität; A-4020 Linz Austria
3. U1006 INSERM/Aix-Marseille Universite; 13009 Marseille France
4. University Hospital Münster; Institute of Medical Microbiology; Clinical Virology; 48151 Münster Germany
5. Materials Science and Technology of Polymers; University of Twente; 7500 AE Enschede The Netherlands