Crowdsourced estimation of cognitive decline and resilience in Alzheimer’s disease, Genevera I. Allena, Nicola Amorosob, Catalina Angheld, Venkat Balagurusamye, Christopher J. Bare, Derek Beatong, Roberto Bellottib, et al, Alzheimer’s & Dementia, v 12, 6, June 16, 2016, Pages 645-653, http://dx.doi.org/10.1016/j.jalz.2016.02.00.