Subclinical hip involvement in rheumatoid arthritis. An ultrasound assessment Vladimir Aroja Santos; Jessica Gutiérrez; Hugo Sandoval; Araceli Bernal-González; Melisa Valdivieso-Ruiz; Sandra Rodríguez-Flores; Mariana Moreno Ramírez; Aarón Daniel Antonio Arrieta Aguilar; Marwin Gutiérrez; Carlos Pineda;

Diagnostic error as a scientific and ethical challenge in establishing the activity of rheumatoid arthritis Yimy F. Medina; Álvaro J. Ruiz;