ADVANCES IN FIBROMYALGIA PSYCHOLOGICAL TREATMENT: THE USE OF VIRTUAL REALITY FOR THE INDUCTION OF POSITIVE EMOTIONS AND PROMOTION OF BEHAVIORAL ACTIVATION. A PILOT STUDY - Herrero, Rocio; Castilla, Diana; Vizcaino, Yolanda; Molinari, Guadalupe; Garcia-Palacios, Azucena; Botella, Cristina (Revista Argentina de Clinica Psicologica, 2013)