1. Radboud University Medical Centre; Department of Pathology; P. O. Box 9101 6500 HB Nijmegen The Netherlands
2. Radboud Institute for Molecular Life Sciences; Department of Biochemistry; Geert-Grooteplein 26 6525 GA Nijmegen The Netherlands
3. Radboud University Medical Centre; Department of Gynecology; P. O. Box 9101 6500 HB Nijmegen The Netherlands