[1] Univ Nacl Autonoma Mexico, ICAT, Ciudad De Mexico 04510, Mexico
[2] Hosp Gen Mexico Dr Eduardo Liceaga, Rheumatol Unit, Mexico City, DF, Mexico
[3] Ctr Med, Maturin, Venezuela
[4] Hosp Prov Rosario, Rosario, Santa Fe, Argentina
[5] Univ La Sabana, Bogota, Colombia
[6] Univ Cuenca, Cuenca, Ecuador
[7] Essalud, Hosp 3, Clin Reumactr, Juliaca, Peru
[8] Hosp Senor Milagro, Salta, Argentina
[9] Univ Autonoma Chihuahua, Fac Med & Ciencias Biomed, Chihuahua, Chihuahua, Mexico
[10] Minist Poder Popular Salud, Red Ambulatoria, Maturin, Venezuela
[11] Univ Autonoma Nuevo Leon, Monterrey, Mexico
[12] HGR 1 IMSS, Unidad Invest, Mexico City, DF, Mexico
[13] Hosp Amerimed, Av Tulum Sur 260,7, Cancan 77500, QR, Mexico
[14] Univ Nacl Autonoma Mexico, Mexico City, DF, Mexico
[15] Minist Salud, Gobierno Prov Santa Fe, Santa Fe, Argentina
[16] Univ Alberta, Edmonton, AB, Canada
[17] Hosp Gen Chilpancingo Dr Raymundo Abarca Alarcon, Chilpancingo Los Bravo, Mexico
[18] Hosp Gen Culiacan, Culiacan, Sinaloa, Mexico
[19] Inst Mexican Seguro Social, Hidalgo Del Parral, Chihuahua, Mexico
[20] Hosp Reg Alta Especialidad, Rheumatol Dept, Oaxaca, Oaxaca, Mexico
[21] Secretaria Salud Publ, Ctr Especialidades Med Ambulatorias Rosario, Municipalidad De Rosario, Santa Fe, Argentina
[22] Hosp Nacl Guillermo Almenara Irigoyen, Lima, Peru
[23] Ctr Invest Clin Morelia, Morelia, Michoacan, Mexico
[24] CREAR, Grp Orono, Santa Fe, Argentina