1. The Fingerland Department of Pathology, Charles University in Prague, Faculty of Medicine and University Hospital in Hradec Kralove, Czech Republic
2. Department of Dentistry, Charles University in Prague, Faculty of Medicine and University Hospital in Hradec Kralove, Czech Republic
3. Institut für Pathologie und Zytodiagnostik, Klinikum Wels – Grieskirchen, Wels, Austria
4. Labor für Dermatohistologie und Oralpathologie, München, Germany
5. Bioptic Laboratory, ltd, Plzen, Czech Republic
6. Department of Pathology, Charles University in Prague, Faculty of Medicine in Plzen, Czech Republic