Screening of cognitive impairment in patients with Parkinson's disease: diagnostic validity of the Brazilian versions of the Montreal Cognitive Assessment and the Addenbrooke's Cognitive Examination-Revised - Sobreira, Emmanuelle; Pena-Pereira, Márcio A.; Eckeli, Alan Luiz; Sobreira Neto, Manoel A.; Chagas, Marcos Hortes Nisihara; Foss, Maria P.; Cholerton, Brenna; Zabetian, Cyrus P.; Mota, Ignacio F.; Tumas, Vitor (Arquivos de Neuro-Psiquiatria, 2015)