1. Department of Obstetrics, Leipzig University, Leipzig, Germany
2. Roche Diagnostics International, Medical and Scientific Affairs, Rotkreuz, Switzerland
3. Roche Diagnostics GmbH, Penzberg, Germany
4. Bioscientia, Institute for Medical Diagnostics GmbH, Ingelheim, Germany
5. Charité Campus Virchow-Klinikum, Berlin, Germany