1. Department of Obstetrics and Gynecology, University of Freiburg, Hugstetter Str. 55, D‐79106, Freiburg, Germany
2. Department of Clinical Chemistry, University of Freiburg, Hugstetter Str. 55, D‐79106, Freiburg, Germany
3. Department of Sports Medicine, University of Freiburg, Hugstetter Str. 55, D‐79106, Freiburg, Germany
4. Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria