1. Department of Dermatology and Venereology Faculty of Medicine University of Cologne and University Hospital of Cologne Cologne Germany
2. Department of Otorhinolaryngology Head and Neck Surgery Faculty of Medicine University of Cologne and University Hospital of Cologne Cologne Germany
3. Institute of Virology Faculty of Medicine University of Cologne and University Hospital of Cologne Cologne Germany
4. National Reference Centre for Poliomyelitis and Enteroviruses Robert Koch Institute Berlin Germany
5. Center for Molecular Medicine Cologne (CMMC) Faculty of Medicine University of Cologne Cologne Germany