Relationship between Self-Efficacy and Headache Impact, Anxiety, and Physical Activity Levels in Patients with Chronic Tension-Type Headache: An Observational Study. - González de la Flor, Ángel; García Pérez de Sevilla, Guillermo; Domíngez Balmaseda, Diego; Martín Vera, Daniel; Montero Martínez, María; Del Blanco Muñiz, Jose Ángel (Behavioural Neurology, 2022)