title: Changing patterns of drug use and HIV infection.
authors: J R
authors: JR
authors: Robertson
authors: J J
authors: JJ
authors: Roberts
authors: J C
authors: JC
authors: Witcomb
authors: J
authors: J
authors: Egan
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000523:psychology; D001294:Attitude to Health; D005260:Female; D015658:HIV Infections / Q000523:psychology*; D006801:Humans; D008297:Male; D012307:Risk Factors; D015819:Substance Abuse, Intravenous / Q000517:prevention & control* / Q000523:psychology