Anatürk, M; Demnitz, N; Ebmeier, KP; Sexton, CE; (2018) A systematic review and meta-analysis of structural magnetic resonance imaging studies investigating cognitive and social activity levels in older adults. Neuroscience & Biobehavioral Reviews , 93 pp. 71-84. 10.1016/j.neubiorev.2018.06.012.