Identifying attentional deficits in people with first-episode psychosis with the Scale for the Assessment of Negative Symptoms attention subscale: is it possible? - González-Blanch C; Priede A; Rodríguez-Sánchez JM; Perez-Iglesias R; Vázquez-Barquero JL; Crespo-Facorro B (Comprehensive psychiatry, 2012)