Dopaminergic dysfunction and cognitive impairment in Parkinson's disease: Evidence from a SPECT study in a large cohort of de-novo patients. (January 2016) - Frosini, Daniela; Giuntini, Martina; Pagni, Cristina; Del Prete, Eleonora; Tognoni, Gloria; Volterrani, Duccio; Bonuccelli, Ubaldo; Ceravolo, Roberto