T Muttusamy1, A Ma2,3, I Sinnerbrink2, A E Quinton4, M J Peek5, S Joung1. 1. Department of Obstetrics and Gynaecology at Nepean Hospital, New South Wales, Australia. 2. Department of Clinical Genetics, Nepean Hospital, New South Wales, Australia. 3. Disciplines of Genetic Medicine, Child and Adolescent Health, Children's Hospital Westmead Clinical School, Sydney University, New South Wales, Australia. 4. Medical Sonography, School of Health, Medical and Applied Science, Central Queensland University, Australia. 5. Medical School, College of Medicine, Biology and Environment, The Australian National University, Australia.