RT Journal Article SR Electronic T1 Oral antiretroviral pre-exposure prophylaxis reduces the risk of HIV acquisition among men who have sex with men JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 146 OP 147 DO 10.1136/ebm1305 VO 16 IS 5 A1 Marie-Claude Boily A1 Benoît R Mâsse A1 Dobromir Dimitrov YR 2011 UL http://ebm.bmj.com/content/16/5/146.abstract AB