1. School of Public Health, Research Center of Epidemiology, Biostatistics and Clinical ResearchUniversité libre de Bruxelles Brussels Belgium
2. Department of Social and Preventive Medicine, School of Public HealthUniversité de Montréal Montreal Quebec Canada
3. School of Public Health, Research Center of Health Policy and Systems ‐ International HealthUniversité libre de Bruxelles Brussels Belgium
4. Department of Development and RegenerationKU Leuven Leuven Belgium
5. Department of Obstetrics and GynecologyUniversity Hospitals Leuven Leuven Belgium
6. Department of Obstetrics, Gynecology and FertilityGasthuiszusters Antwerpen Wilrijk Belgium