1. Department of Obstetrics & Gynecology; Inselspital; University of Bern; Switzerland
2. Division of Human Genetics; Department of Pediatrics; Inselspital; University of Bern; Switzerland
3. The Folkhälsan Institute of Genetics; University of Helsinki; Helsinki Finland
4. Praxis für Humangenetik; Paul-Ehrlich-Strasse 22 DE 72076 Tübingen Germany