Validation of a European Spanish-version of the Self-Evaluation of Negative Symptoms (SNS) in patients with schizophrenia Leticia García-Álvarez; Clara Martínez-Cao; Teresa Bobes-Bascarán; Almudena Portilla; Philippe Courtet; Lorena de la Fuente-Tomás; Ángela Velasco; Leticia González-Blanco; Paula Zurrón-Madera; Eduardo Fonseca-Pedrero; Pilar A. Sáiz; María Paz García-Portilla; Julio Bobes;