Survey to evaluate exposure to environmental factors in patients with rheumatoid arthritis Alexandra Zúñiga, Alba Luz León Álvarez, Luisa Carbal-Reyes, Daniel Rodríguez, Juan-Camilo Díaz, Gloria Vásquez, Diana Castaño

Are Prognostic Factors Useful in Rheumatoid Arthritis? Montserrat Robustillo Villarino, Jesús Rodríguez Moreno

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