Sharing needles and the spread of HIV in Italy's addict population.
D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission*; D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007558:Italy; D008297:Male; D009339:Needles; D019966:Substance-Related Disorders / Q000150:complications*