https://pdfs.semanticscholar.org/d480/900464ef8a78cf4702ae8b4a9c9a20a35cdf.pdf a few (7) validated apps for cognitive decline testing | https://pdfs.semanticscholar.org/d480/900464ef8a78cf4702ae8b4a9c9a20a35cdf.pdf a few (7) validated apps for cognitive decline testing |