Risk factors associated with injection initiation among drug users in Northern Thailand

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Yingkai Cheng, Susan G Sherman, Namtip Srirat, Tasanai Vongchak, Surinda Kawichai, Jaroon Jittiwutikarn, Vinai Suriyanon, Myat H Razak, Teerada Sripaipan and David D Celentano^*