TY - JOUR T1 - Use of condoms: pitfalls of retrospective case-note analysis JF - Sexually Transmitted Infections JO - Sex Transm Infect SP - 130 LP - 130 DO - 10.1136/sextrans-2017-053181 VL - 94 IS - 2 AU - David Barlow Y1 - 2018/03/01 UR - http://sti.bmj.com/content/94/2/130.abstract N2 - In the early 1970s an American researcher suggested that condoms were ineffective in preventing STD transmission.1 Uncertain about the argument, I studied condom use in men attending our GUM department at St Thomas’ Hospital.I addressed two potentially confounding factors: had condoms been used at every … ER -