[1] Queen Mary University of London,Women‘s Health Research Unit, Wolfson Institute for Population Health
[2] London North West Hospitals NHS Trust,Hewitt Fertility Centre
[3] Centre for Reproductive and Genetic Health,Department of Preventative Medicine and Public Health, Faculty of Medicine
[4] Liverpool Women’s Hospital,Fertility Unit
[5] University of Granada,undefined
[6] CIBER Epidemiology and Public Health,undefined
[7] Homerton University Hospital NHS Trust London,undefined