1. Pediatric Infectious Diseases Unit, University Children's Hospital Mannheim, University of Heidelberg, Heidelberg, Germany
2. Institute of Biochemistry II, Medical Faculty, University of Cologne, Cologne, Germany
3. Schaller Research Group at the University of Heidelberg and the DKFZ, Heidelberg, Germany
4. Department of Infectious Diseases, Virology, University of Heidelberg, Heidelberg, Germany