1. School of Reproductive Medicine and Paediatrics; Faculty of Health Sciences; University of Adelaide; Adelaide South Australia Australia
2. Department of Obstetrics and Gynaecology; Australian National University Medical School; Canberra Australian Capital Territory Australia
3. Department of Orthopaedic Surgery; Women's and Children's Hospital; Adelaide South Australia Australia
4. Pregnancy Outcome Unit; South Australian Department of Health; Adelaide South Australia Australia
5. Centre for Perinatal Care; Flinders Medical Centre; Adelaide South Australia Australia