How to run a successful needle exchange program.
D005260:Female; D015658:HIV Infections / Q000517:prevention & control* / Q000635:transmission; D006801:Humans; D008297:Male; D008404:Massachusetts; D018671:Needle-Exchange Programs / Q000331:legislation & jurisprudence* / Q000458:organization & administration*; D015819:Substance Abuse, Intravenous; D014861:Washington