1. Biomedical Center of the Faculty of Medicine in Pilsen Charles University Pilsen Czech Republic
2. Sikl's Department of Pathology University Hospital in Pilsen Pilsen Czech Republic
3. Biopticka Laborator s.r.o. Pilsen Czech Republic
4. Department of Dermatovenereology, Second Faculty of Medicine Charles University, Bulovka University Hospital Prague Czech Republic
5. National Reference Laboratory for Papillomaviruses and Polyomaviruses Institute Hematology and Blood Transfusion Prague Czech Republic
6. Department of Surgery, First Faculty of Medicine Charles University, Bulovka University Hospital Prague Czech Republic
7. Faculty of Education, Centre for Biology, Geoscience and Environmental Education University of West Bohemia Pilsen Czech Republic
8. Global Change Research Institute Czech Academy of Science Brno Czech Republic