[1] CREAR, Grp Orono Rosario, Rosario, Argentina
[2] Univ Cient Sur, Lima, Peru
[3] GLADEL, Rosario, Argentina
[4] Hosp Privado, Ctr Med Cordoba, Cordoba, Argentina
[5] Hosp Italiano Buenos Aires, Internal Med Serv, Rheumatol Sect, Buenos Aires, DF, Argentina
[6] Univ Sao Paulo HCFMUSP, Fac Med, Hosp Clin, Rheumatol Div, Sao Paulo, Brazil
[7] Univ San Sebastian, Fac Med & Ciencia, Ctr Biol Celular & Biomed, Santiago, Chile
[8] Ctr Invest Clin Morelia, Morelia, Michoacan, Mexico
[9] Univ Alabama Birmingham, Birmingham, AL USA