Robles, R., M. Gili, J. Gelabert, M. Llull, F. Bestard, C. Vicens, N. Bauzá, and M. Roca. 2009. “Sociodemographic and Psychopathological Features of Frequent Attenders in Primary Care”. Actas Españolas De Psiquiatría 37 (6):320-25. https://actaspsiquiatria.es/index.php/actas/article/view/1156.