1. Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynaecology, Erasmus University Medical Centre, Rotterdam, The Netherlands
2. Centre for Reproductive Medicine, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Laarbeeklaan 101-1090, Brussels, Belgium
3. Department of Medical Microbiology and Infection Control, Amsterdam UMC—location VUmc, Amsterdam, The Netherlands
4. Division of Obstetrics and Prenatal Diagnosis, Department of Obstetrics and Gynaecology, Erasmus University Medical Centre, Rotterdam, The Netherlands