1. Department of Gynecology, Obstetrics and Reproductive Medicine, University Medical School of Saarland, 66421 Homburg, Saarland, Germany
2. Kantonsspital Baden, Im Ergel 1, 5404 Baden, Switzerland
3. Frauenarztpraxis, Berliner Promenade 15, 66111 Saarbrücken, Germany
4. Department of Gynecology and Obstetrics, University Medical Center Mainz, Langenbeckstraße 1, 55131 Mainz, Germany
5. Department of Obstetrics and Gynecology, ‘Carol Davila’ University of Medicine and Pharmacy, 020021 Bucharest, Romania