Prevalence and associated knowledge of hepatitis B infection among healthcare workers in Freetown, Sierra Leone by Yu-Ling Qin, Bo Li, Yue-Su Zhou, Xin Zhang, Lei Li, Bing Song, Peng Liu, Yue Yuan, Zhong-Peng Zhao, Jun Jiao, Jing Li, Yi Sun, Stephen Sevalie, Joseph E. Kanu, Ya-Jun Song, Jia-Fu Jiang, Foday Sahr, Tian-Jun Jiang, Chinese Military Medical Experts Group in Sierra Leone

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