1. Dermatovenereology Department, Second Faculty of Medicine Charles University, University Hospital Bulovka Prague Czech Republic
2. Dermatovenereology Department, Third Faculty of Medicine Charles University, Kralovske Vinohrady University Hospital Prague Czech Republic
3. Department of Genetics and Microbiology; Faculty of Science Charles University Prague Czech Republic
4. National Reference Laboratory for Papillomaviruses and Polyomaviruses Institute of Hematology and Blood Transfusion Prague Czech Republic