1. Institute of Pathology, University Medical Center Hamburg‑Eppendorf, D‑20246 Hamburg, Germany
2. Department of Gynecology, University Medical Center Hamburg‑Eppendorf, D‑20246 Hamburg, Germany
3. Department of Gynecology, Regio Clinic Pinneberg, D‑25421 Pinneberg, Germany
4. Department of Pathology, Basel University Clinics, 4031 Basel, Switzerland
5. Department of Gynecology, Regio Clinic Elmshorn, D‑25337 Elmshorn, Germany
6. Department of Gynecology, Clinical Centre Itzehoe, D‑25524 Itzehoe, Germany
7. Department of Gynecology, Albertinen Clinic Schnelsen, D‑22457 Hamburg, Germany
8. Institute of Pathology, Clinical Centre Osnabrück, D‑49076 Osnabrück, Germany