1. Department of Obstetrics and Gynecology, University Medical Center Mainz, 55131 Mainz, Germany
2. Department of Statistics, TU Dortmund University, 44227 Dortmund, Germany
3. Institute of Pathology, University Medical Center Mainz, 55131 Mainz, Germany
4. Leibniz-Research Centre for Working Environment and Human Factors at the TU Dortmund (IfADo), 44139 Dortmund, Germany