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Harm Reduction Journal > 2015 > 12 > 1 > 1-9
BMC Infectious Diseases > 2015 > 16 > 1 > 1-10
AIDS and Behavior > 2007 > 11 > 5 > 687-697
Harm Reduction Journal > 2015 > 12 > 1 > 1-9
BMC Infectious Diseases > 2015 > 16 > 1 > 1-10
AIDS and Behavior > 2007 > 11 > 5 > 687-697