The association between interleukin-6 promoter polymorphisms and rheumatoid arthritis by ethnicity: A meta-analysis of 33 studies Blanca T. Pacheco-Soto; Leonardo M. Porchia; William C. Lara-Vazquez; Enrique Torres-Rasgado; Ricardo Perez-Fuentes; M. Elba Gonzalez-Mejia;

Association between hypothyroidism and elderly-onset rheumatoid arthritis: A cross-sectional study at national hospital in Peru Paul J. Tejada-Llacsa; Vidia Lumbe Diaz; Carlos Diaz-Arocutipa;

Survival of first line biological and targeted synthetic disease-modifying anti-rheumatic drugs in patients with rheumatoid arthritis in Chile Marcos Cruces Olivar; Allan D. Burboa; Yolanda M. Gómez;