1. Centre for Big Data Research in Health, Faculty of Medicine University of New South Wales Sydney New South Wales Australia
2. National Perinatal Epidemiology and Statistics, School of Women's and Children's Health, Faculty of Medicine University of New South Wales Sydney New South Wales Australia
3. Newborn Care, Royal Prince Alfred Hospital Sydney New South Wales Australia
4. Charles Perkins Centre, Faculty of Medicine University of Sydney Sydney New South Wales Australia
5. Women's and Children's Health, St George Hospital Sydney New South Wales Australia
6. Department of High Risk Obstetrics, Royal Prince Alfred Hospital Sydney New South Wales Australia
7. Discipline of Obstetrics, Gynaecology and Neonatology, Faculty of Medicine University of Sydney Sydney New South Wales Australia
8. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Solna Sweden