1. Sexual Health Victoria, Box Hill, Victoria, Australia
2. Department of Obstetrics and Gynecology, School of Medicine, Oregon Health and Science University, Portland, Oregon
3. Department of Obstetrics and Gynaecology, Queen Mary Hospital, University of Hong Kong, Hong Kong, Hong Kong
4. Department of Obstetrics and Gynecology, Stanford University School of Medicine, Palo Alto, California
5. Faculty of Medicine and Health, Daffodil Centre, University of Sydney, Sydney, Australia