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.

The National Academies of Sciences, Engineering, and Medicine
500 Fifth St. N.W. | Washington, D.C. 20001

Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement