Not the same, but is it the same? Cycling of biologic agents in rheumatoid arthritis. Experience in the Instituto Mexicano del Seguro Social Francisco Javier Aceves-Ávila; José Ramiro Hernández Vásquez; Sandra Sicsick; María de Lourdes Olguín Ortega; María Azucena Ramos Sánchez; Adelfia Urenda Quezada; Lizbet Tinajero Nieto; Freddy Jose Faccin; Miguel Angel Ramírez Ramírez; Natali Serra-Bonett; Angel Mario Coll Muñoz;

Association of electrocardiographic altered P wave dispersion and vascular endothelial growth factor in rheumatoid arthritis Osmar Antonio Centurión; Paloma de Abreu; Gabriela Avila-Pedretti; Sonia R. Cabrera; María T. Martínez de Filártiga; Astrid Paats; Judith M. Torales; Christian O. Chávez; Carmen R. Montiel; Laura B. García; Karina E. Scavenius; Rocío del Pilar Falcón; Jose C. Candia; Alfredo J. Meza; Isabel Acosta-Colmán;

Agreement between cardiovascular risk scores in a high-altitude Andean population with rheumatoid arthritis Carlos Diaz-Arocutipa; Vidia Lumbe-Diaz; Percy Soto-Becerra;