1. University of Groningen, University Medical Center Groningen, Department of Obstetrics and Gynecology, The Netherlands
2. University of Groningen, University Medical Center Groningen, Department of Medical Microbiology, The Netherlands
3. University of Groningen, University Medical Center Groningen, Department of Pathology, The Netherlands
4. University of Oxford, Oxford Cancer Centre, Churchill Hospital Molecular and Population Genetics Laboratory, The Wellcome Trust Centre for Human Genetics, Oxford, United Kingdom