affiliation not provided to SSRN, University Medical Center Mainz - Department of Obstetrics and Gynecology, affiliation not provided to SSRN, Université Libre de Bruxelles (ULB) - Institute Jules Bordet, Netherlands Cancer Institute, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Marburg - Institute for Pathology, affiliation not provided to SSRN, affiliation not provided to SSRN, Netherlands Cancer Institute, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Hannover Medical School, Centre Eugène Marquis, affiliation not provided to SSRN, University Hospital Düsseldorf - Department of Gynecology and Obstetrics, University Hospital Zurich, German Breast Group (GBG Forschungs GmbH) - German Breast Group, German Breast Group (GBG Forschungs GmbH), German Breast Group (GBG Forschungs GmbH) and University of Hamburg - University Medical Center Hamburg-Eppendorf