1. Gynecological Endocrinology and Reproductive Medicine, University Clinic for Gynecology and Obstetrics, Inselspital Bern, Bern, Switzerland
2. Department for Gynaecological Endocrinology and Fertility Disorders, University Hospital Heidelberg, Heidelberg, Germany;
3. Statistik-Auswertung Beratung Weiterbildung, Chemnitz, Germany
4. Department for Reproductive Endocrinology, University Hospital Zurich, Zurich, Switzerland
5. Department of Gynecology, University Clinic Hamburg-Eppendorf, Hamburg, Germany
6. Department of Obstetrics and Gynecology, Aretaeio Hospital, Athens, Greece
7. Department of Gynecological Endocrinology, Beijing Obstetrics & Gynecology Hospital, Capital Medical University, Beijing, China
8. Hormone Hamburg, Hamburg, Germany