Affiliation: | 1. Department of Gynecology and Obstetrics, Cantonal Hospital Frauenfeld, , Frauenfeld, Switzerland;2. Department of Gynecology and Obstetrics, Lutheran Hospital Hagen‐Haspe, , Hagen, Germany;3. Department of Gynecology and Obstetrics, Georg August University Goettingen, , Goettingen, Germany |