Negative Symptoms: A Brief Story and Advances in Spain William T. Carpenter Jr;

Risk factors of deficit and non-deficit schizophrenia: Results from a cross-sectional study Agnieszka Cyran; Patryk Piotrowski; Jerzy Samochowiec; Tomasz Gr¿¿lewski; B¿a¿ej Misiak;

Early versus late risk factors for deficit and nondeficit schizophrenia Setareh Alabaf; Brian Kirkpatrick; Shanquan Chen; Rudolf N. Cardinal; Emilio Fernandez-Egea;