1 Faculty of Mathematics and Computer Science, University of Bremen, Bremen, Germany.
2 Department of Obstetrics, Gynecology, Gynecologic Oncology, and Senology, Bethesda Hospital Duisburg, Duisburg, Germany.
3 Unit of Gynecologic Oncology, ARNAS "Civico - Di Cristina - Benfratelli", Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (PROMISE), University of Palermo, Palermo, Italy.