1. Institute of Laboratory Medicine, General Hospital Linz, Krankenhausstrasse 9, A-4020 Linz, Austria
2. Siemens Medical Solutions Diagnostics, Hohe Strasse 4-8, D-61231 Bad Nauheim, Germany
3. Department of Dermatology, General Hospital Linz, Krankenhausstrasse 9, A-4020 Linz, Austria
4. Institute of Virology, University of Cologne, Fürst-Pückler-Strasse, D-5650935 Cologne, Germany