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Platt, L., Wall, M., Rhodes, T., Judd, A., Hickman, M., Johnston, L.G., Renton, A., Bobrova, N. and Sarang, A. (2006) Methods to Recruit Hard-to-Reach Groups: Comparing Two Chain Referral Sampling Methods of Recruiting Injecting Drug Users across Nine Studies in Russia and Estonia. Journal of Urban Health, 83, 39-53. http://dx.doi.org/10.1007/s11524-006-9101-2

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