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Reaching hidden populations of drug users by privileged access interviewers: methodological and practical issues
P. GRIFFITHS, M. GOSSOP, B. POWIS, J. STRANGVolume:
88
Year:
1993
Language:
english
Pages:
10
DOI:
10.1111/j.1360-0443.1993.tb02036.x
File:
PDF, 2.55 MB
english, 1993