1. Department of Gynecology and ObstetricsUniversity Hospital EssenEssenGermany
2. Institute of Molecular BiologyUniversity of Duisburg‐EssenEssenGermany
3. Department of Obstetrics and GynecologyUniversity Medical Center Groningen, University of GroningenGroningenThe Netherlands
4. Central Animal LaboratoryUniversity of Duisburg‐EssenEssenGermany
5. Experimental and Clinical Research Center, a joint cooperation between the Max Delbrück Center for Molecular Medicine in the Helmholtz Association and the Charité Medical FacultyBerlinGermany
6. Berlin Institute of Health (BIH)BerlinGermany