1 Department of Obstetrics and Gynecology, University Medical Centre Erlangen, Erlangen, 91054 Erlangen. Electronic address: anna.dietl@uk-erlangen.de.
2 Department of Obstetrics and Gynecology, University Medical Centre Freiburg, Freiburg iBr, 79106 Freiburg, Germany. Electronic address: maximilian.klar@uniklinik-freiburg.de.
3 Institute for Surgical Pathology, Medical Centre-University of Freiburg, Freiburg, Germany.