Corrigendum: An fMRI Study of Neuronal Activation in Schizophrenia Patients with and without Previous Cannabis Use - Løberg, Else-Marie; Nygård, Merethe; Berle, Jan Øystein; Johnsen, Erik; Kroken, Rune A.; Jørgensen, Hugo A.; Hugdahl, Kenneth (Frontiers in Psychiatry, 2013)