Influence of age and sex on the diagnostic accuracy of pleural fluid carcinoembryonic antigen for malignant pleural effusion: a post hoc analysis by Dan-Ni Yang, Dan-Ni Yang, Jian-Xun Wen, Yan Niu, Ling Hai, Ling Hai, Qian Yang, Qian Yang, Su-Na Cha, Su-Na Cha, Cheng Yan, Cheng Yan, Hong-Zhe Zhu, Hong-Zhe Zhu, Ting-Wang Jiang, Li Yan, Jin-Hong Huang, Hong Chen, Xin-Ru Zuo, Wen-Qi Zheng, Wen-Qi Zheng, Zhi-De Hu, Zhi-De Hu

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