Clinical features of patients with hands arthralgia referred from primary care physicians to rheumatologists: A cohort study Gabriel Figueroa-Parra, Martha Mariana Castañeda-Martinez, Pablo Herrera-Sandate, Diana Daniela Castañeda-Martinez, Jorge Antonio Esquivel-Valerio, David Vega-Morales

Rheumatoid factor testing in Spanish primary care: A population-based cohort study including 4.8 million subjects and almost half a million measurements Klara Morsley, Anne Miller, Raashid Luqmani, Francesc Fina-Aviles, Muhammad Kassim Javaid, Christopher J. Edwards, Rafael Pinedo-Villanueva, Manuel Medina, Sebastian Calero, Cyrus Cooper, Nigel Arden, Daniel Prieto-Alhambra

Role of rheumatoid factor isotypes and anti-citrullinated peptide antibodies in the differential diagnosis of non-selected patients with inflammatory arthralgia Jorge Armando Hermosillo-Villafranca, Andrés Heriberto Guillén-Lozoya, David Vega-Morales, Itzel Pérez-Onofre, Tayde Sarahi Gracia-Aréchiga, Mario Alberto Garza-Elizondo, Alejandro Garza-Alpirez, Diana Raquel Rodriguez-Rodriguez