[1] Univ Oxford, Christ Church, Oxford, England
[2] Peterborough City Hosp, North West Anglia NHS Fdn Trust, Peterborough, England
[3] Univ Auckland, Cochrane Gynaecol & Fertil Grp, Auckland, New Zealand
[4] Manchester Univ NHS Fdn Trust, Manchester Acad Hlth Sci Ctr, Dept Obstet & Gynaecol, Manchester, Lancs, England
[5] Univ Oxford, Radcliffe Womens Hlth Patient & Publ Participat P, Oxford, England
[6] Univ Edinburgh, MRC Ctr Reprod Hlth, Edinburgh, Midlothian, Scotland
[7] Newcastle Upon Tyne Hosp NHS Fdn Trust, Newcastle Fertil Ctr, Newcastle, Tyne & Wear, England
[8] UCL, Inst Womens Hlth, London WC1E 6BT, England
[9] Kings Coll London, Sch Life Course Sci, Dept Women & Childrens Hlth, London, England
[10] Fetal Med Res Inst, Kings Fertil, London, England