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Risk factors of HIV infection and prevalence of co-infections among men who have sex with men in Beijing, China.
Zhang, Xiaoxi a; Wang, Chen a; Hengwei, Wang a; Li, Xinxu b; Li, Dongliang a; Ruan, Yuhua b; Zhang, Xiaoyan b; Shao, Yiming b
21 Suppl 8:S53-S57, December 2007.
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