[1] Univ La Sabana, Grp Invest Espondiloartropatias, Hosp Mil Cent, Bogota, Colombia
[2] Hosp Gen Mexico City, Rheumatol Unit, Mexico City, DF, Mexico
[3] Natl Hlth Inst, Natl Hlth Observ, Bogota, Colombia
[4] BIOMAB IPS, Bogota, Colombia
[5] Univ La Sabana, Epidemiol Dept, Chia, Colombia