1. Department of Reproductive Endocrinology University Hospital Zurich Zurich Switzerland
2. Department of Gynecology and Obstetrics Cantonal Hospital St. Gallen St. Gallen Switzerland
3. Department of Gynecology and Obstetrics Cantonal Hospital Schaffhausen Schaffhausen Switzerland
4. Department of Gynecology and Obstetrics Triemli Hospital Zürich Switzerland
5. Department of Gynecology University Hospital Zurich Zurich Switzerland