[1] Hosp Clin Porto Alegre, Ctr Pesquisas, Bipolar Disorders Program, BR-90035003 Porto Alegre, RS, Brazil
[2] Univ Fed Santa Maria, Ctr Ciencias Saude, Dept Neuropsychiat, BR-97105900 Santa Maria, RS, Brazil
[3] Univ Fed Rio Grande do Sul, Inst Ciencias Besicas Saude, Dept Biochem, BR-90035003 Porto Alegre, RS, Brazil
[4] McGill Univ, Montreal Neurol Inst, McConnell Brain Imaging Ctr, Montreal, PQ H2A 2B4, Canada