1. Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands
2. Department of Gynecologic Oncology, University Medical Center Groningen, University of Groningen, The Netherlands
3. Department of Radiation Oncology, Leiden University Medical Center, Leiden, The Netherlands
4. Department of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
5. Department of Pathology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands