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\bibitem{Battjes+Pickens1989} Battjes, R. J., \& Pickens, R. W. (1989). \textit{Needle sharing among intravenous drug abusers : national and international perspectives}  (R. J. Battjes, R. W. Pickens, H. W. Haverkos, W. Hopkins, H. W. Feldman, P. Biernackl, et al., Eds.). Rockville: U.S. Department of Health and Human Services, Public Health Service, alcohol, Drug Abuse, and Mental Health Administration; National Institute on Drug Abuse (NIDA).

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