1. National Perinatal Epidemiology and Statistics Unit, School of Women's & Children's Health and Centre for Big Data Research in Health, The University of New South Wales (UNSW), Sydney, Australia
2. Menzies Centre for Health Policy, University of Sydney, Sydney, Australia
3. School of Demography, Australian National University, Canberra, Australia
4. Fenner School of Environment & Society, Australian National University, Canberra, Australia
5. School of Women's & Children's Health, UNSW, Sydney Australia
6. Research Centre for Reproductive Health & Med, University of Adelaide, Adelaide, Australia