[1] Inst Rehabil Psicofis, Buenos Aires, DF, Argentina
[2] Fdn Reumatol Argentina, Buenos Aires, DF, Argentina
[3] Univ Sao Paulo, Sch Med, Sao Paulo, Brazil
[4] Hosp Univ Dr Jose Eleuterio Gonzalez, Monterrey, Mexico
[5] Hosp Gen Mexico City, Mexico City, DF, Mexico
[6] Inst Portugue Reumatol, Lisbon, Portugal
[7] Hosp Nacl E Rebagliti ESSALUD, Lima, Peru
[8] Inst Nacl Reumatol, Montevideo, Uruguay
[9] Pontificia Univ Catolica Chile, Santiago, Chile
[10] Univ Lisbon, Inst Mol Med, Fac Med, P-1699 Lisbon, Portugal
[11] Hosp Egas Moniz, Ctr Hosp Lisboa Ocidental, Lisbon, Portugal
[12] Hosp Padilla, San Miguel De Tucuman, Argentina
[13] Hosp Gen Mexico City, Mexico City, DF, Mexico
[14] IMIBIC Reina Sofia Hosp, Cordoba, Spain