Effectiveness of a psychoeducation group intervention conducted by primary healthcare nurses in patients with depression and physical comorbidity: study protocol for a randomized, controlled trial. - Casañas, Rocío; Martín Royo, Jaume; Fernandez-San-Martín, Maria Isabel; Raya Tena, Antonia; Mendioroz, Jacobo; Sauch Valmaña, Glòria; Masa-Font, Roser; Casajuana-Closas, Marc; Fernandez Linares, Eva María; Cols-Sagarra, Cèlia; Gonzalez Tejón, Susana; Foguet-Boreu, Quintí; et al. (BMC Health Services Research, 2019)