1. Department of Obstetrics and Gynecology, Radboud University Medical Centre, Nijmegen, The Netherlands;
2. Department of Obstetrics and Gynecology, Northwestern University, Chicago, IL, USA;
3. School of Women and Children’s Health Faculty of Medicine, University of New South Wales, Sydney, Australia;
4. Department of Preventive Medicine, Northwestern University, Feinberg School of Medicine, Chicago, IL, USA