Exercise improves cognition in Parkinson's disease: The PRET-PD randomized, clinical trial.
David FJ, Robichaud JA, Leurgans SE, Poon C, Kohrt WM, Goldman JG, Comella CL, Vaillancourt DE, Corcos DM. Exercise improves cognition in Parkinson's disease: The PRET-PD randomized, clinical trial. Mov Disord. 2015 Oct; 30(12):1657-63.