The Association between Social Engagement, Loneliness, and Risk of Dementia: A Systematic Review and Meta-Analysis. Penninkilampi R, Casey A-N, Singh MFiatarone, Brodaty H J Alzheimers Dis. 2018; 66(4):1619-1633. PMID: 30452410. Abstract Comment Bookmark Recommend Follow Comment | Bookmark | Recommend | Follow