Fresán, A., et al. “Premorbid Functioning by Gender and Its Relationship With Duration of Untreated Phychosis in First Psychotic Episode”. Actas Españolas De Psiquiatría, vol. 31, no. 2, Mar. 2003, pp. 53-58, https://actaspsiquiatria.es/index.php/actas/article/view/944.