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The correlates and predictive validity of HIV risk groups among drug users in a community-based sample: methodological findings from a multi-site cluster analysis
Dennis, Michael L., (2001)
Implications for evaluation and intervention planning for special populations at risk for HIV
Wechsberg, Wendee M., (2001)
Changing needle practices in community outreach and methadone treatment,
Wechsberg, Wendee M., (1994)