1. Department of Medical Imaging Toowoomba Hospital South Toowoomba Queensland Australia
2. Discipline of Obstetrics, Gynaecology and Neonatology, Sydney Medical School Nepean University of Sydney, Nepean Hospital Penrith New South Wales Australia
3. Christopher Kohlenberg Department of Perinatal Ultrasound Nepean Hospital Penrith New South Wales Australia
4. Medical Sonography, School of Health, Medical and Applied Science, Central Queensland University Sydney New South Wales Australia