| http://www.w3.org/ns/prov#value | - However, one possible explanation for this discrepancy could be related to differences in the pattern and amount of drug use between the samples.1,16,17 In Western countries, methamphetamine abusers often use other drugs, mainly cocaine or cannabis68- 70; however, no information is provided with respect to this issue in the study by Wilson and colleagues.67 Because methamphetamine is more likely t
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