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;

Ultrasound tenosynovitis: A differential feature of patients with seronegative rheumatoid arthritis Santiago Ruta; Einer Sanchez Prado; Facundo Salvatori; Juan Arguello; Darío Aguerre; Sebastián Magri; Rodrigo García Salinas;

Ocular inflammatory manifestations in patients with rheumatoid arthritis Raul E. Ruiz-Lozano; Luis Arnaldo Prida-Espaillat; Reinaldo A. Moll-Auais; Eugenia M. Ramos-Dávila; Manuel E. Quiroga-Garza; Aaron Zhao; Ali Khodor; Amr Almobayed; David Vega-Morales; Alejandro Rodriguez-Garcia;