Factor structure of the Positive and Negative Affect Schedule (PANAS) in adult women with fibromyalgia from Southern Spain: the al-Ándalus project oleh Fernando Estévez-López, Manuel Pulido-Martos, Christopher J. Armitage, Alison Wearden, Inmaculada C. Álvarez-Gallardo, Manuel Javier Arrayás-Grajera, María J. Girela-Rejón, Ana Carbonell-Baeza, Virginia A. Aparicio, Rinie Geenen, Manuel Delgado-Fernández, Víctor Segura-Jiménez