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International Journal of Drug Policy > 2010 > 21 > 2 > 115-118
International Journal of Drug Policy > 2009 > 20 > 4 > 365-370
International Journal of Drug Policy > 2007 > 18 > 2 > 136-140
International Journal of Drug Policy > 2010 > 21 > 2 > 115-118
International Journal of Drug Policy > 2009 > 20 > 4 > 365-370
International Journal of Drug Policy > 2007 > 18 > 2 > 136-140