RT Journal Article SR Electronic T1 Increased body mass index and reduced efficacy of oral emergency contraception: how many women might be affected? JF Journal of Family Planning and Reproductive Health Care JO J Fam Plann Reprod Health Care FD British Medical Journal Publishing Group SP 234 OP 235 DO 10.1136/jfprhc-2016-101464 VO 42 IS 3 A1 Woodhall, Sarah C A1 Lowndes, Catherine M A1 Craig, Rachel A1 Mindell, Jennifer S A1 Anderson, Dame Jane A1 Guthrie, Kate A A1 Johnson, Dame Anne M A1 Nardone, Anthony YR 2016 UL http://jfprhc.bmj.com/content/42/3/234.abstract AB