Syringe sharing among London drug abusers.
D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission*; D000293:Adolescent; D006801:Humans; D007275:Injections, Intravenous; D008131:London; D009339:Needles; D012306:Risk; D019966:Substance-Related Disorders; D013594:Syringes