1. Northern Clinical School; University of Sydney; Sydney Australia
2. Discipline of Obstetrics, Gynaecology and Neonatology, Faculty of Medicine; University of Sydney; Sydney Australia
3. Department of High Risk Obstetrics; Royal Prince Alfred Hospital; Sydney Australia
4. Department of Obstetrics and Gynaecology; Chinese University of Hong Kong; Hong Kong China
5. Sydney Ultrasound For Women; Sydney Australia