1. Department of Reproductive Endocrinology, University Hospital Zurich , 8910 Zurich, Switzerland
2. Department of Reproductive Endocrinology, Canton Hospital Lucerne , 6000 Lucerne, Switzerland
3. Department of Gynecology, University Hospital Zurich , 8910 Zurich, Switzerland
4. Department of Psychosomatics, Charité Berlin , 10117 Berlin, Germany
5. Division of Gynecology , Endocrinology, and Reproductive Medicine, Department of Obstetrics and Gynecology, , 8036 Graz, Austria
6. University Hospital Graz , Endocrinology, and Reproductive Medicine, Department of Obstetrics and Gynecology, , 8036 Graz, Austria
7. Department of Gynecology and Obstetrics, Canton Hospital St Gallen , 9000 St Gallen, Switzerland
8. Department of Gynecology and Obstetrics, Triemli Hospital Zurich , 8063 Zurich, Switzerland