[1] Pontificia Univ Javeriana, Hosp Univ San Ignacio, Unidad Reumatol, Bogota, Colombia
[2] Pontificia Univ Javeriana, Dept Med Interna, Hosp Univ San Ignacio, Bogota, Colombia
[3] Univ Fed Parana, Curitiba, Parana, Brazil
[4] Hosp Univ Japones, Santa Cruz, Bolivia
[5] Pacif Salud Hosp Punta Pacif, Panama City, Panama
[6] Hosp Policia Nacl N1 Quito, Quito, Ecuador
[7] Inst Hondureno Seguridad Social, Tegucigalpa, Honduras
[8] Univ Republica, Inst Nacl Reumatol Uruguay, Montevideo, Uruguay
[9] Hosp Mexico, San Jose, Costa Rica
[10] Univ Ciencias Med La Habana, Havana, Cuba
[11] Ctr Reg Enfermedades Autoinmunes & Reumat CREAR, Rosario, Argentina
[12] Hosp Metropolitano Santiago HOMS, Santiago, Dominican Rep
[13] EsSalud Univ Cient Sur, Hosp Nacl Guillermo Almenara Irigoyen, Lima, Peru
[14] Ctr Invest Clin Morelia, Morelia, Michoacan, Mexico
[15] Univ Nacl Asuncion, Hosp Clin, Asuncion, Paraguay
[16] Univ San Carlos, Inst Guatemalteco Seguridad Social, Ciudad De Guatemala, Guatemala
[17] Pontificia Univ Catolica Chile, Santiago, Chile
[18] Consultorio Especialidades Inst Salvadoreno Segur, San Salvador, El Salvador
[19] Inst Med Ganna, Managua, Nicaragua
[20] Univ Oriente, Ctr Clin Univ Oriente, Ciudad Bolivar, Venezuela
[21] Inst Univ Hosp Italian Buenos Aires, Secc Reumatol, Serv Clin Med Hosp Italiano Buenos Aires, Buenos Aires, DF, Argentina