1. Department Of Obstetrics and Gynecology, Centre for Ultrasound and Prenatal Medicine, Buergerhospital and Clementine Children’s Hospital Frankfurt a.M, Dr. Senckenberg Foundation and Johann-Wolfgang-Goethe University of Frankfurt, Frankfurt, Germany
2. Faculty of Medicine, Philipps University of Marburg, Marburg, Germany
3. Department of Obstetrics and Prenatal Medicine, Asklepios Clinics Hamburg, Hamburg, Germany