[1] Univ Manchester, Div Canc Sci, Gynaecol Oncol Res Grp, Fac Biol Med & Hlth, Manchester, Lancs, England
[2] Manchester Univ NHS Fdn Trust, Manchester Acad Hlth Sci Ctr, St Marys Hosp, Dept Obstet & Gynaecol, Manchester, Lancs, England
[3] Manchester Univ Hosp NHS Fdn Trust, Manchester Acad Hlth Sci Ctr, Manchester Cytol Ctr, Manchester, Lancs, England
[4] Manchester Univ NHS Fdn Trust, Manchester Acad Hlth Sci Ctr, Res & Innovat, Manchester, Lancs, England
[5] Univ Manchester, Ctr Biostat, Div Populat Hlth, Hlth Serv Res & Primary Care,Fac Biol Med & Hlth, Manchester, Lancs, England