Chronic insomnia in patients with Parkinson disease: which associated factors are relevant? - Sobreira Neto, Manoel Alves; Pena-Pereira, Márcio Alexandre; Sobreira, Emmanuelle Silva Tavares; Chagas, Marcos Hortes Nisihara; Almeida, Carlos Mauricio Oliveira de; Fernandes, Regina Maria França; Tumas, Vitor; Eckeli, Alan Luiz (Journal of Geriatric Psychiatry and Neurology, 2020)