Spanish validation of the self-evaluation of negative symptoms scale SNS in an adolescent population. - Rodríguez-Testal, Juan F.; Perona-Garcelán, Salvador; Dollfus, Sonia; Valdés-Díaz, María; García-Martínez, Jesús; Ruíz-Veguilla, Miguel; Senín-Calderón, Cristina (BMC Psychiatry, 2019)