1. Department of Gynecology and Obstetrics, University of Schleswig-Holstein
2. Department of Pathology University of Schleswig-Holstein, Lübeck, Germany
3. Department of Gynecology and Obstetrics, Aachen, Germany
4. Department of Gynecology and Obstetrics, Emory University, Atlanta, Georgia
5. Department of Gynecology and Obstetrics, University of Schleswig-Holstein,