1. Organización Medica de Investigación , Buenos Aires, Argentina
2. Rheumatology Division, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul , Porto Alegre, Rio Grande do Sul, Brazil
3. Medical Specialties Department, Rheumatology Section, King Fahad Medical City , Riyadh, Saudi Arabia
4. Department of Medicine, LKS Faculty of Medicine, The University of Hong Kong , Pokfulam, Hong Kong, China
5. Subang Jaya Medical Centre , Subang Jaya, Selangor, Malaysia
6. Taichung Veterans General Hospital , Taichung, Taiwan, Republic of China