1. Obstetrics and Gynaecology Department; The Canberra Hospital Garran; Australian Capital Territory 2605 Australia
2. Department of Obstetrics and Gynaecology; Australian National University Medical School Canberra; Australian Capital Territory 0200 Australia
3. Fetal Medicine Unit; Women and Children's Health Services The Canberra Hospital Garran; Australian Capital Territory 2605 Australia