Evidence from a meta-analysis and systematic review reveals the global prevalence of mild cognitive impairment oleh Wen-xin Song, Wei-wei Wu, Yuan-yuan Zhao, Hai-lun Xu, Guan-cheng Chen, Shan-yu Jin, Jie Chen, Jie Chen, Shao-xiang Xian, Shao-xiang Xian, Jing-hong Liang