1. Department of Medical Microbiology, Tumor Virology and Cancer Immunotherapy, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
2. Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
3. Department of Obstetrics & Gynecology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands