MIF and rheumatoid arthritis: Our working group has reported earlier the association of MIF promoter polymorphisms with the susceptibility to develop RA in Western Mexican population (Llamas‐Covarrubias et al., 2013), which is a Mestizo population with markedly European ancestry (60%–64%), followed by Amerindian (21%–25%) and African (≈15%) (Rangel‐Villalobos et al., 2008).