1. Clinical and Population Perinatal Health Research Kolling Institute Northern Sydney Local Health District St Leonards New South Wales Australia
2. Biostatistics Training Program New South Wales Ministry of Health North Sydney New South Wales Australia
3. Sydney Medical School Northern University of Sydney Sydney New South Wales Australia
4. Department of Obstetrics and Gynecology Royal North Shore Hospital St Leonards New South Wales Australia
5. School of Public Health and Community Medicine University of New South Wales Kensington New South Wales Australia
6. Sydney School of Public Health University of Sydney Sydney New South Wales Australia