1. Department of Obstetrics and Gynecology; Ludwig-Maximilians-University Hospital; Munich Germany
2. Department of Obstetrics and Gynecology; Hannover Medical School; Hannover Germany
3. Department of Gynecology and Obstetrics; Technische Universität Dresden; Dresden Germany
4. Department of Obstetrics and Gynecology; Klinikum Starnberg; Starnberg Germany
5. LIFE-Center; Hospital of the University of Munich; Munich Germany