1. Virology Department, Institute of Medical Microbiology and Virology, University of Leipzig, Johannisallee 30, 04103 Leipzig, Germany
2. Department of Pediatrics, University of Leipzig, Liebigstrasse 20a, 04103 Leipzig, Germany
3. Department of Respiratory Medicine, University of Leipzig, Liebigstrasse 20, 04103 Leipzig, Germany
4. Department of Pediatrics, Klinikum St. Georg, Delitzscher Strasse 141, 04129 Leipzig, Germany