1. Institute of Pathology; Philipps-University Marburg; Germany
2. Center for Human Genetics; Freiburg Germany
3. Department of Pediatric Pathology; University Clinic Bonn; Germany
4. Prenatal-Medicine (MVZ); München Germany
5. Center for Prenatal Medicine; Dortmund Germany
6. Department of Gynecology and Obstetrics; University Münster; Germany
7. Institute of Medical Genetics; Medical University Vienna; Austria
8. Institute of Human Genetics; University Münster; Germany