Prevalence and risk factors of active pulmonary tuberculosis among elderly people in China: a population based cross-sectional study by Can-You Zhang, Fei Zhao, Yin-Yin Xia, Yan-Ling Yu, Xin Shen, Wei Lu, Xiao-Meng Wang, Jin Xing, Jian-Jun Ye, Jian-Wei Li, Fei-Ying Liu, Jian-Lin Wu, Lin Xu, Hui Zhang, Jun Cheng, Li-Xia Wang

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