1. Amsterdam UMC, Vrije Universiteit Amsterdam, Department of Pathology, Cancer Center Amsterdam, Amsterdam, The Netherlands
2. Department of Gynecologic Oncology, University of Groningen, University Medical Center Groningen, Cancer Research Center Groningen, Groningen, The Netherlands
3. Department of Pathology, University of Groningen, University Medical Center Groningen, Cancer Research Center Groningen, Groningen, The Netherlands