Recommendations by the Spanish Society of Rheumatology on Fibromyalgia. Part 1: Diagnosis and treatment Javier Rivera Redondo; Petra Díaz del Campo Fontecha; Cayetano Alegre de Miquel; Miriam Almirall Bernabé; Benigno Casanueva Fernández; Cristina Castillo Ojeda; Antonio Collado Cruz; Pilar Montesó-Curto; Ángela Palao Tarrero; Eva Trillo Calvo; Miguel Ángel Vallejo Pareja; Noé Brito García; Carol Merino Argumánez; M. Nieves Plana Farras;

Development and feasibility of 4 checklists for the evaluation of comorbidity in patients with rheumatoid arthritis, axial spondyloarthritis and psoriatic arthritis: GECOAI Project Santos Castañeda; Carlos González; Virginia Villaverde; Cristina Lajas Petisco; María Carmen Castro; Fernando Jirout; Juan Carlos Obaya; Juan Carlos Hermosa; Carmen Suárez; Silvia García; María Rodero; Leticia León; Amparo López Esteban; Milena Gobbo; Laly Alcaide; Juan Carlos Torre-Alonso;

Fibromyalgia with elevated rheumatoid factor is associated with poor therapeutic response but not with progression to rheumatoid arthritis. Prospective cohort study Freddy Liñán Ponce; Juan Leiva Goicochea; David Sevilla Rodríguez; Elmer Hidalgo Bravo; Ginna Obregón Atanacio; Inés Loyola Macalapú; Paola Jáuregui Rojas; Jackeline Yampufe Canani;