1. Department of Obstetrics and Gynecology, University Hospital and Medical Faculty of the Heinrich-Heine University Duesseldorf, Duesseldorf, Germany
2. Molecular Proteomics Laboratory, BMFZ, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
3. Institute for Molecular Medicine, University Hospital Duesseldorf, Duesseldorf, Germany
4. NMI Natural and Medical Sciences Institute at the University of Tuebingen, Reutlingen, Germany
5. Department of Women's Health, University Hospital and Faculty of Medicine of the Eberhard Karls University Tuebingen, Tuebingen, Germany