1. Department of Reproductive and Neonatal Health, James Cook University, Townsville, QLD, Australia;
2. College of Medicine and Dentistry, James Cook University, Townsville, QLD, Australia;
3. Department of Obstetrics and Gynaecology, James Cook University, Townsville, QLD, Australia;
4. Department of Obstetrics and Gynaecology, Port Moresby General Hospital, Port Moresby, Papua New Guinea