Evaluation of the experience of patients with chronic pain after participation in group therapies. Design of a qualitative study using focus groups - Nocete Navarro, L; Palao Tarrero, A; Torrijos Zarcero, M; Rocamora Gonzalez, C; Bermudez Castro, M; Calle, D H; Garcia Higuera, E; Rodriguez Vega, B (EUROPEAN PSYCHIATRY, 2019)