Vanphanom Sychareun*, Visanou Hansana, Sysavanh Phommachanh, Vathsana Somphet, Phouthong Phommavongsa, Brigitte Tenni, Timothy Moore and Nick Crofts
* Corresponding author: Vanphanom Sychareun vsychareun@gmail.com
Harm Reduction Journal 2012, 9:28 doi:10.1186/1477-7517-9-28
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