1. Clinical and Population Perinatal Health Research (F.J.S., N.N., V.T., J.M.M., C.L.R.), Kolling Institute of Medical Research, University of Sydney, Sydney, New South Wales (NSW) 2065, Australia
2. Fetal Maternal Medicine (Pacific Laboratory Medicine Services) (V.T.), St. Leonards, NSW 2065, Australia
3. Department of Obstetrics, Gynaecology and Neonatology (J.M.M., C.L.R.), Royal North Shore Hospital, St. Leonards, NSW 2065, Australia