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D. Heckathorn, S. Semaan, R. Broadhead and J. Hughes, “Extensions of Respondent-Driven Sampling: A New Approach to the Study of Injection Drug Users Aged 18 - 25,” AIDS and Behavior, Vol. 6, No. 1, 2002, pp. 55-67. http://dx.doi.org/10.1023/A:1014528612685

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