1. Department of Obstetrics and Gynecology; Medical University Vienna; Vienna Austria
2. Vall d'Hebron University Hospital; Universitat Autònoma de Barcelona; Barcelona Spain
3. University of Liège, CHR de la Citadelle; Liège Belgium
4. University of Oxford; Oxford UK
5. Oslo University Hospital and University of Oslo; Oslo Norway
6. Karolinska University Hospital; Stockholm Sweden
7. Uppsala University; Uppsala Sweden
8. Department of Obstetrics and Gynaecology; The University of Melbourne and Royal Women's Hospital; Melbourne Australia
9. Leipzig University; Leipzig Germany
10. Roche Diagnostics International Ltd; Rotkreuz Switzerland
11. Roche Diagnostics GmbH; Penzberg Germany
12. Charité -Universitätsmedizin; Berlin Germany