Predictors of HIV infection and prevalence for syphilis infection among injection drug users in China: Community-based surveys along major drug trafficking routes by Li Chunmei, Qu Shuquan, Ni Mingjian, Liu Wei, Lu Lin, Xiao Yan, Sun Xinhua, Zeng Gang, Lu Fan, Jia Yujiang, Liu Jianbo, Wu Pingsheng, Vermund Sten H

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