1 Department of Obstetrics and Gynaecology, Wollongong Hospital, Wollongong, NSW, Australia.
2 Acute Gynaecology, Early Pregnancy and Advanced Endosurgery Unit, Sydney Medical School Nepean University of Sydney, Nepean Hospital, Kingswood, NSW, Australia.
3 OMNI Gynaecological Care Centre for Women's Ultrasound and Early Pregnancy, St Leonards, Sydney, NSW, Australia.