[1] St Joseph Univ, Internal Med Dept, Beirut, Lebanon
[2] Hotel Dieu France Hosp, Alfred Naccache Blvd Achrafieh, Beirut, Lebanon
[3] St Joseph Univ, Rheumatol Dept, Beirut, Lebanon
[4] Djillali Bounaama Univ Hosp, Rheumatol Dept, Algiers, Algeria
[5] Fac Med El Mahdi Si Ahmed, Blida, Algeria
[6] Al Jahra Hosp, Internal Med Dept, Unit Rheumatol, Minist Hlth, Kuwait, Kuwait
[7] Al Faisal Univ, King Faisal Specialist Hosp & Res Ctr, Coll Med, Dept Pediat,Div Rheumatol, Riyadh, Saudi Arabia
[8] Univ Baghdad, Coll Med, Dept Med, Rheumatol Unit, Baghdad, Iraq
[9] Jordan Hosp & Med Ctr, Dept Internal Med, Rheumatol Div, Amman, Jordan
[10] Specialized Med Ctr, Dept Internal Med, Div Rheumatol, Riyadh, Saudi Arabia
[11] King Hussein Med Ctr, Royal Med Serv, Rheumatol Div Internal Med, Jordan Armed Forces, Amman, Jordan
[12] Jaber Alahmed Hosp, Dept Internal Med, Unit Rheumatol, Minist Hlth, Kuwait, Kuwait
[13] Int Univ Rabat UIR, Hlth Sci Coll, Dept Med, Rabat, Morocco
[14] Lab Clin Res & Epidemiol, Fac Med, Fes, Morocco