1. Department of Obstetrics and Gynaecology; University of Tübingen; Tübingen Germany
2. Department of Obstetrics and Gynaecology; University of Bonn; Bonn Germany
3. Department of Obstetrics and Gynaecology; University of Cologne; Cologne Germany
4. Institute of Medical Genetics and Applied Genomics; University of Tübingen; Tübingen Germany