Characteristics and hiv risk behaviors among injection drug users in St. Petersburg, Russia: A comparison of needle exchange program attenders and nonattenders JOURNAL OF DRUG ISSUES Ksobiech, K., Somlai, A. M., Kelly, J. A., Benotsch, E., Gore-Felton, C., McAuliffe, T., Ostrovski, D., Kozlov, A. P. 2004; 34 (4): 787-803

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