1. Rheumatology Division, Universidad Federal de São Paulo, São Paulo, Brazil
2. School of Medicine, Rosario National University, Santa Fe, Argentina
3. Rheumatology Unit, Pontificia Universidad Javeriana, Hospital Universitario San Ignacio. Bogotá, Colombia
4. Rheumatology Unit, Hospital, Italiano de Buenos Aires, Buenos Aires, Argentina
5. Rheumatology Unit, Hospital Italiano de La Plata, La Plata, Buenos Aires, Argentina
6. School of Medicine, Universidad Cientifica del Sur, Lima, Peru
7. Primary Systemic Vasculitides Clinic, Instituto Nacional de Enfermedades Respiratorias, Mexico City, Mexico
8. Rheumatology Unit, Hospital Universitario San Jorge, Risaralda, Colombia
9. Rheumatology Unit, Hospital Italiano de Cordoba, Cordoba
10. Rheumatology Unit, Hospital San Jose, Pergamino, Argentina
11. Immunology Unit, Hospital Central, Mendoza, Argentina
12. Rheumatology Unit, Hospital Privado de Mendoza, Godoy Cruz, Argentina
13. Rheumatology Unit, Hospital Municipal San Cayetano, Virreyes, Argentina
14. Vasculitis and Glomerulonephritis Center, Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Harvard Medical School, Boston, MA.