1. Department of Obstetrics and GynaecologyUniversity of Tübingen Tübingen Germany
2. Fetal Medicine Foundation USA Dayton OH USA
3. Division of Maternal Fetal MedicineWright State University Dayton OH USA
4. Department of Obstetrics and GynaecologyUniversity of Cologne Cologne Germany
5. Department of Obstetrics and GynaecologyUniversity of Bonn Bonn Germany