Effect of a CYP2D6 polymorphism on the efficacy of donepezil in patients with Alzheimer disease Alberto Pilotto, MD, M. Franceschi, MD, G. DOnofrio, PsyD, A. Bizzarro, MD, F. Mangialasche, MD, L. Cascavilla, MD, F. Paris, MD, M. G. Matera, BiolD, Andrea Pilotto, MD, A. Daniele, MD, P. Mecocci, MD, C. Masullo, MD, B. Dallapiccola, MD and D. Seripa, BiolD From the Geriatric Unit and Ge