1. Discipline of Obstetrics and Gynaecology and the Robinson Research Institute, University of Adelaide, Adelaide, South Australia, Australia
2. Department of Perinatal Medicine, Women’s and Babies Division, Women’s and Children’s Hospital, Adelaide, South Australia, Australia
3. Department of Obstetrics and Gynaecology, Lyell McEwin Hospital, Elizabeth, South Australia, Australia
4. Department of Obstetrics, Gynaecology and Neonatology, University of Sydney, Sydney, New South Wales, Australia
5. Charles Perkins Centre, Sydney, New South Wales, Australia
6. Department of Kinesiology, California Polytechnic State University, San Luis Obispo, California, USA