The coexistence of rheumatoid arthritis and ankylosing spondylitis: Case series and literature review Hanene Lassoued Ferjani; Ben Ayed Hiba; Dorra Ben Nessib; Dhia Kaffel; Kaouther Maatallah; Wafa Hamdi;

Association of disease activity and health assessment with the risk of falls in RA patients: Are DAS-28 and HAQ-DI scores related with the risk of falls assessed in RA patients? Rodrigo Lozano-Lozano; Jorge Antonio Esquivel-Valerio; Mitzi Rivera-Beltrán; Oscar Martínez-Díaz; Alondra Elizabeth Montoya-Montes; David Vega-Morales;

History of 50 years of the Rheumatology Service of Universidad Nacional de Colombia: The first in Colombia and a pioneer in Latin America Yimy F. Medina; Antonio Iglesias Gamarra;