Global cognitive performance is associated with sleep efficiency measured by polysomnography in patients with Parkinson’s disease - Sobreira, Emmanuelle Silva Tavares; Sobreira Neto, Manoel Alves; Pena-Pereira, Márcio Alexandre; Chagas, Marcos Hortes Nisihara; Fernandes, Regina Maria França; Eckeli, Alan Luiz; Tumas, Vitor (Psychiatry and Clinical Neurosciences, 2019)