XIE Tong,JU Han-fang,WANG Chun-hua, WANG Zhi-rui, MU Cheng,ZHAO Hui, WANG Yan-nan, WANG Xie-xiu.. Ancient Mycobacterium tuberculosis Beijing genotype clinical isolates are associated with drug resistance in Tianjin, China[J]. Chinese Journal of Antituberculosis, 2015, 37(9): 928-932. doi: doi:10.3969/j.issn.1000-6621.2015.05.003