1. Institute of Virology, University of Veterinary Medicine Hannover, Hannover, Germany
2. Food and Drug Administration (FDA), Center for Biologics Evaluation and Research (CBER), Silver Spring, MD, USA
3. Infection Biology Unit, German Primate Center Göttingen, Göttingen, Germany
4. Division of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
5. Institute of Virology, University of Bonn Medical Center, Bonn, Germany