APOE ε4 lowers age at onset and is a high risk factor for Alzheimer's disease; A case control study from central Norway - Sando, Sigrid B; Melquist, Stacey; Cannon, Ashley; Hutton, Michael L; Sletvold, Olav; Saltvedt, Ingvild; White, Linda R; Lydersen, Stian; Aasly, Jan O (BMC neurology, 2008)