1. Department of Obstetrics and Gynecology; University Hospital of Würzburg; Würzburg Germany
2. Endokrinologikum Hamburg; Hamburg Germany
3. Department of Obstetrics and Gynecology; Hospital of Landshut-Achdorf; Landshut Germany
4. Department of Obstetrics and Gynecology; University Medical Centre Mannheim; Heidelberg University; Mannheim Germany