Factor structure, reliability, and item parameters of the Brazilian-Portuguese version of the GAD-7 questionnaire - Moreno, André Luiz; Sousa, Diogo A. de; Souza, Ana Maria Frota Lisbôa P.; Manfro, Gisele Gus; Salum, Giovanni Abrahão; Koller, Silvia Helena; Osório, Flávia de Lima; Crippa, José Alexandre de Souza (Trends in Psychology/Temas em Psicologia, 2016)