1. Department of Medicine, Hospital Universitário Cassiano, Antonio Moraes da Universidade Federal do Espírito Santo (HUCAM-UFES/EBSERH), Vitória, Brazil
2. Department of Internal Medicine, Rheumatology Unit, Hospital Bernardino Rivadavia, Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina
3. Hospital das Clínicas de Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
4. Department of Rheumatology, Clinics Hospital, San Lorenzo, Paraguay
5. Department of Immunology and Rheumatology, Instituto Nacional de Ciencias Médicas y Nutrición, Salvador Zubirán, Mexico City, Mexico