RT Journal Article SR Electronic T1 Use of condoms: pitfalls of retrospective case-note analysis JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 130 OP 130 DO 10.1136/sextrans-2017-053181 VO 94 IS 2 A1 Barlow, David YR 2018 UL http://sti.bmj.com/content/94/2/130.abstract AB