[1] Univ Melbourne, Dept Obstet & Gynaecol, Parkville, Vic, Australia
[2] Royal Womens Hosp, Dept Maternal Fetal Med, Parkville, Vic, Australia
[3] Gold Coast Univ Hosp, Maternal Fetal Med Unit, Southport, Qld, Australia
[4] Griffith Univ, Sch Med & Dent, Southport, Qld, Australia