HIV-, HCV-, and co-infections and associated risk factors among drug users in southwestern China: a township-level ecological study incorporating spatial regression. by Yi-Biao Zhou, Qi-Xing Wang, Song Liang, Yu-Han Gong, Mei-xia Yang, Shi-Jiao Nie, Lei Nan, Ai-Hui Yang, Qiang Liao, Yang Yang, Xiu-Xia Song, Qing-Wu Jiang

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