1. Department of Reproductive Medicine, Amsterdam UMC, Vrije Universiteit, HV Amsterdam, the Netherlands
2. Clinical Epidemiology and Biostatistics, Amsterdam UMC, Vrije Universiteit, HV Amsterdam, the Netherlands
3. Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynaecology, Erasmus University Medical Center, CA Rotterdam, The Netherlands
4. Department of Obstetrics and Gynaecology, Sint Franciscus Hospital, PM Rotterdam, The Netherlands