Degree of protection provided by poverty alleviation policies for the middle-aged and older in China: evaluation of effectiveness of medical insurance system tools and vulnerable t... by Wanxin Tian, Bing Wu, Yahong Yang, Yongqiang Lai, Wenqing Miao, Xiyu Zhang, Chenxi Zhang, Qi Xia, Linghan Shan, Huiying Yang, Huiqi Yang, Zhipeng Huang, Yuze Li, Yiyun Zhang, Fan Ding, Yulu Tian, Hongyu Li, Xinwei Liu, Ye Li, Qunhong Wu

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