RT Journal Article SR Electronic T1 Randomised placebo controlled trials in HIV infection: to be or not to be? JF Genitourinary Medicine JO Genitourin Med FD BMJ Publishing Group Ltd SP 143 OP 145 DO 10.1136/sti.65.3.143 VO 65 IS 3 A1 Gelmon, K A1 Weller, I V YR 1989 UL http://sti.bmj.com/content/65/3/143.abstract AB