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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. O'Brien, M.U., J. Murray, F. Cannarozzi, A. Jimenez, W. Johnson, L. Ouellet, and W. Wiebel 1995a Needle Exchange in Chicago: The Demand for Free Needles and Their Effect on Injecting Frequency and Needle Use. Draft manuscript. 1995b Needle Exchange in Chicago: The Effects of Exchange Use on HIV Risk Behavior and Incidence. Draft manuscript. Stolzenberg, R.M., and D.A. Relles 1990 Theory testing in a world of constrained research design: The significance of Heckman's censored sampling bias correction for nonexperimental research. Sociological Methods and Research 18:395-415. Watters, J.K., M.J. Estilo, G.L. Clark, and J. Lorvick 1994 Syringe and needle exchange as HIV/AIDS prevention for injecting drug users. Journal of the American Medical Association 271(2):115-120. Wiebel, W.W. 1990 Identifying and gaining access to hidden populations. Pp. 4-11 in E.Y. Lambert and W.W. Wiebel, eds., Collection and Interpretation of Data in Hidden Populations. Rockville, MD: National Institute on Drug Abuse. Winship, C., and R.D. Mare 1992 Models for sample selection bias. Annual Review of Sociology 18:327-350.
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