Cannabidiol monotherapy for treatment-resistant schizophrenia - Zuardi, Antonio Waldo; Hallak, Jaime Eduardo Cecílio; Dursun, Serdar Murat; Morais, Sílvio Luiz; Sanches, Rafael Faria; Musty, Richard E.; Crippa, José Alexandre de Souza (Journal of Phychopharmacology, 2006)