1. Centre for Biostatistics, School of Health Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre (MAHSC); University of Manchester; Manchester UK
2. Department of Obstetrics and Gynaecology; University of Melbourne; Melbourne Australia
3. Centre for Biostatistics; University of Manchester; Manchester UK
4. Department of Obstetrics and Gynaecology; Monash University; Clayton Australia
5. Department of Gynecology and Reproductive Medicine; University Medical Centre; Utrecht, Heidelberglaan Netherlands
6. Centre For Fertility Care; Dijklander Hospital; Waterlandlaan, Purmerend Netherlands