1. Faculty of Health, Centre for Midwifery and Child and Family Health University of Technology Sydney Ultimo Australia
2. School of Women's and Children's Health, UNSW Medicine University of New South Wales Sydney Australia
3. National Perinatal Epidemiology and Statistics Unit, Centre for Big Data Research in Health University of New South Wales Sydney Australia
4. Department of Women's and Children's Health St George Hospital Sydney Australia
5. The George Institute for Global Health UNSW Medicine University of New South Wales Australia