18 Investigation of intravenous drug using in studies has shown a decreasing trend of the rate in recent years such that this amount has fallen from 37.0% in 2001 based on Khani and Vakili 24 to 6.5% in 2006 based on Hosseini et al. 16 This reduction can be attributed strategies such as harm reduction, greater coverage with methadone maintenance therapy, increased knowledge level in society and a better-informed media.
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