1. Institute for Virology, University Medical Center, Freiburg, Germany
2. Institute for Cell and Gene Therapy, University Medical Center, Freiburg, Germany
3. Department of Medicine II, University Medical Center, Freiburg, Germany
4. Public Health Office, Freiburg, Germany
5. Department of Medicine I, University Medical Center, Freiburg, Germany
6. Institute of Clinical Microbiology and Hygiene, Regensburg University Medical Center, Regensburg, Germany