title: Increased body mass index and reduced efficacy of oral emergency contraception: how many women might be affected?
authors.affiliation: Principal Scientist, National Infection Service, Public Health England (PHE), London, UK; sarah.woodhall@phe.gov.uk.
authors.forename: Sarah C
authors.initials: SC
authors.lastname: Woodhall
authors.affiliation: Consultant Epidemiologist, National Infection Service, PHE, London, UK; cmlowndes@googlemail.com.
authors.forename: Catherine M
authors.initials: CM
authors.lastname: Lowndes
authors.affiliation: Group Head, NatCen Social Research, London, UK; rachel.craig@natcen.ac.uk.
authors.forename: Rachel
authors.initials: R
authors.lastname: Craig
authors.affiliation: Reader in Public Health, Research Department of Epidemiology and Public Health, UCL, London, UK; j.mindell@ucl.ac.uk.
authors.forename: Jennifer S
authors.initials: JS
authors.lastname: Mindell
authors.affiliation: Consultant Physician and Advisor, Health and Wellbeing Directorate, PHE, London, UK; jane.anderson@phe.gov.uk.
authors.forename: Dame Jane
authors.initials: DJ
authors.lastname: Anderson
authors.affiliation: Clinical Expert, Sexual & Reproductive Health, Health and Wellbeing Directorate, PHE, London, UK; kate.guthrie@phe.gov.uk.
authors.forename: Kate A
authors.initials: KA
authors.lastname: Guthrie
authors.affiliation: Professor of Infectious Disease Epidemiology, Research Department of Infection and Population Health, UCL, London, UK; anne.johnson@ucl.ac.uk.
authors.forename: Dame Anne M
authors.initials: DA
authors.lastname: Johnson
authors.affiliation: Consultant scientist, National Infection Service, Public Health England, London, UKHealth and Wellbeing Directorate, Public Health England, London, UK; anthony.nardone@phe.gov.uk.
authors.forename: Anthony
authors.initials: A
authors.lastname: Nardone
keywords: emergency contraception; surveys