[1] UCL, Elizabeth Garrett Anderson Inst Womens Hlth, Sch Life & Med Sci, Fac Populat Hlth Sci, London, England
[2] Kings Coll London, St Thomas Hosp, Sch Life Course Sci, Dept Women & Childrens Hlth,Fac Life Sci & Med, London, England
[3] Univ Coll London Hosp NHS Fdn Trust, Womens Hlth Serv, Elizabeth Garrett Anderson Wing, London, England
[4] Miscarriage Assoc, Wakefield, England
[5] Univ Coll London Hosp NHS Fdn Trust, Elizabeth Garrett Anderson Wing, Gynaecol Diagnost & Outpatient Treatment Unit, London, England