1. Department of Dermatology, Venereology, and Allergology HELIOS St. Elisabeth Hospital Oberhausen University Witten‐Herdecke Oberhausen Germany
2. Department of Neurosurgery HELIOS St. Elisabeth Hospital Oberhausen Oberhausen Germany
3. National Reference Center for Papilloma‐ and Polyomaviruses Institute of Virology University of Cologne Cologne Germany