A Kreuter1, U Wieland2. 1. Department of Dermatology, Venereology, and Allergology, HELIOS St. Elisabeth Hospital, Oberhausen, University Witten/Herdecke, Germany. alexander.kreuter@helios-kliniken.de. 2. National Reference Center for Papilloma- and Polyomaviruses, Institute of Virology, Uniklinik Köln, University of Cologne, Cologne, Germany.