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;

Practical aspects of biological throught levels and antidrug antibodies in rheumatoid arthritis and spondyloarthritis José Rosas; María Martín-López; Teresa Otón; Alejandro Balsa; Jaime Calvo-Alén; Raimon Sanmartí; Jesús Tornero; Loreto Carmona;

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;