1. School of Women’s and Children’s Health, University of New South Wales, Sydney, NSW, Australia;
2. Royal Hospital for Women, Sydney, NSW, Australia;
3. Biostatistics and Medical Writing, WriteSource Medical Pty Ltd, Sydney, NSW, Australia;
4. School of Medicine, University of New South Wales, Sydney, NSW, Australia;
5. Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia;
6. Institute of Obstetrics and Gynaecology, Epworth HealthCare, Melbourne, VIC, Australia;
7. Family Planning NSW, Sydney, NSW, Australia;
8. Discipline of Obstetrics, Gynaecology and Neonatology, University of Sydney, Sydney, NSW, Australia;
9. Mater Clinical Unit, Faculty of Medicine, University of Queensland, Brisbane, QLD, Australia