Poppers use and Sexual Partner Concurrency Increase the HIV Incidence of MSM: a 24-month Prospective Cohort Survey in Shenyang, China
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H. Shang | Junjie Xu | Yongjun Jiang | Q. Hu | Z. Chu | Jing Zhang | W. Geng | Hongyi Wang | K. Yun | Yong-hui Zhang