Prevalence and Risk Factor of Cognitive Impairment were Different between Urban and Rural Population: A Community-Based Study. Tang H-D, Zhou Y, Gao X, Liang L, Hou M-M, Qiao Y, Ma J-F, Di Chen S- J Alzheimers Dis. 2016; 49(4):917-25. PMID: 26519443. Abstract Comment Bookmark Recommend Follow Comment | Bookmark | Recommend | Follow