Cannabidiol can improve complex sleep-related behaviours associated with rapid eye movement sleep behaviour disorder in Parkinson's disease patients: a case series - Chagas, M. H. N.; Eckeli, A. L.; Zuardi, Antonio Waldo; Pena-Pereira, M. A.; Sobreira-Neto, M. A.; Sobreira, E. T.; Camilo, M. R.; Bergamaschi, M. M.; Schenck, C. H.; Hallak, Jaime Eduardo Cecílio; Tumas, Vitor; Crippa, José Alexandre de Souza (Journal of Clinical Pharmacy and Therapeutics, 2014)