1. Department of Women's and Children's Health, Karolinska Institutet, and the WHO Collaborating Centre for Human Reproduction, Karolinska University Hospital, Stockholm, Sweden
2. Department of Global Public Health, Karolinska Institutet, Stockholm, Sweden
3. Department of Obstetrics, Gynecology and Reproductive Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
4. University of Capetown, Department of Public Health, Capetown, South Africa
5. Centre for Reproductive Health, Institute for Regeneration & Repair, University of Edinburgh, UK Chalmers Centre, NHS Lothian, Edinburgh, UK