1 Department of Surgery, University Hospital, Plzen-Bory, Czech Republic.
2 Department of Orthopaedics and Traumatology, Third Faculty of Medicine, Charles University, and University Hospital Kralovske Vinohrady, Prague, Czech Republic.
3 Department of Surgery, Third Faculty of Medicine, Charles University, and University Hospital Kralovske Vinohrady, Prague, Czech Republic.
4 Department of Dermatovenerology, Third Faculty of Medicine, Charles University, and University Hospital Kralovske Vinohrady, Prague, Czech Republic. spyros@centrum.cz.