Loading metrics Open Access Peer-reviewed Research Article Citation: Rosal AE, Torres-Carmona E, Martin SL, Boileau I, Graff-Guerrero A, Strafella AP (2026) The effect of Apolipoprotein E4 on cognitive function in Parkinson’s disease: A structural MRI study in the PPMI cohort. PLoS One 21(1): e0341240.