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.