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Preliminary study on prevalence, risk factor and genetic homogeneity of porcine reproductive and respiratory syndrome virus in registered pig farms in Heilongjiang, China. Wang Jingfei, Wen H., Wang Shaoli, Sun W., Shen N., Liu Z., Liu Yating, Jiang C., Sun G., Goutard Flavie, Cai X.. 2016. Transboundary and Emerging Diseases, 63 (5) : e369-e380.