1 Department of Special Operative and Oncologic Gynaecology, Asklepios-Clinic Hamburg, 22763 Hamburg, Germany; Department of Gynecology, University of Cologne, Medical Faculty, Cologne, Germany. Electronic address: ch.koehler@asklepios.com.
2 Department of Radiation Oncology, University of Cologne, Medical Faculty, Cologne, Germany; CyberKnife Center, Cologne, Germany.