1. Department of Gynecology and Obstetrics, University Hospital Munster, Munster, Germany
2. Prenatal Medicine, Centre for Prenatal Medicine, Dortmund, Germany
3. Fetal Cardiology, Heart and Diabetes Center NRW Bad Oeynhausen, Bad Oeynhausen, Germany
4. Prenatal Medicine and Human Genetics, Centre for Prenatal Medicine and Human Genetics, Munster, Germany
5. Insitute of Human Genetics, University Hospital Munster, Munster, Germany