RT Journal Article SR Electronic T1 Back to basics in HIV prevention: focus on exposure JF BMJ JO BMJ FD British Medical Journal Publishing Group SP 1384 OP 1387 DO 10.1136/bmj.326.7403.1384 VO 326 IS 7403 A1 Pisani, Elizabeth A1 Garnett, Geoff P A1 Grassly, Nicholas C A1 Brown, Tim A1 Stover, John A1 Hankins, Catherine A1 Walker, Neff A1 Ghys, Peter D YR 2003 UL http://www.bmj.com/content/326/7403/1384.abstract AB