1. Institute for Social Medicine and Epidemiology University of Luebeck Lübeck Germany
2. Department of Obstetrics and Gynecology University Hospital of Schleswig‐Holstein Campus Luebeck Lübeck Germany
3. Department of Gynaecology and Obstetrics Hospital Dueren gem. GmbH Düren Germany
4. Department of Obstetrics and Gynecology Ernst von Bergmann Clinic Potsdam Germany
5. Institute for Cancer Epidemiology e.V University of Luebeck Lübeck Germany