1. Department of Obstetrics and Gynecology, University Hospital Cologne, 50931 Cologne, Germany
2. Department of Obstetrics and Gynecology, Ketteler Hospital, 63071 Offenbach, Germany
3. Institute of Clinical Chemistry and Clinical Pharmacology, University Hospital Bonn, 53127 Bonn, Germany
4. Munich Biomarker Research Center, Institute of Laboratory Medicine, German Heart Centre, Technical University Munich, 80636 Munich, Germany
5. CEBIO GmbH—Center for Evaluation of Biomarkers, 81679 Munich, Germany