RT Journal Article SR Electronic T1 Changing patterns of drug use and HIV infection. JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 430 OP 431 VO 40 IS 339 A1 Robertson, J R A1 Roberts, J J A1 Witcomb, J C A1 Egan, J YR 1990 UL http://bjgp.org/content/40/339/430.2.abstract AB