[1] Univ Mohammed Vth Souissi, Rabat, Morocco
[2] El Ayachi Hosp, Sale, Morocco
[3] Secur Force Hosp, Riyadh, Saudi Arabia
[4] King Hussein Med Ctr, Royal Med Serv, Amman, Jordan
[5] Weill Cornell Med Sch, Doha, Qatar
[6] Riyadh Mil Hosp, Riyadh, Saudi Arabia
[7] Mafraq Hosp, Abu Dhabi, U Arab Emirates
[8] Tripoli Med Ctr, Tripoli, Libya
[9] Jakaranda Hosp, Pretoria, South Africa
[10] Cairo Univ Hosp, Cairo, Egypt
[11] Cairo Univ, Giza, Egypt
[12] King Faisal Specialist Hosp & Res Ctr Jeddah, Riyadh, Saudi Arabia
[13] Hamad Med Corp, Doha, Qatar
[14] Univ Cadi Ayyad, Fac Med & Pharm Marrakech, Sidi Abbad 40000, Morocco
[15] Mubarak Al Kabir Hosp, Dept Med, Kuwait, Kuwait
[16] EHS Appareil Locomoteur, Hop Ben Aknoun, Serv Rhumatol, Algiers, Algeria
[17] EPS La Rabta, Tunis, Tunisia
[18] King Fahad Natl Guard Hosp, Riyadh 11426, Saudi Arabia
[19] Amer Univ Beirut, Med Ctr, Beirut 11072020, Lebanon
[20] Univ Tunis El Manar, Hop Mongi Slim, La Marsa 2046, Tunisia
[21] Cairo Univ, Kasr El Aini Hosp, Dept Rheumatol, Riyadh 11451, Saudi Arabia
[22] Univ Camilo Jose Cela, Sch Hlth Sci, Madrid 28692, Spain
[23] Paris Descartes Univ, EA 4058, Cochin Hosp, APHP,UPRES,Rheumatol Dpt B, Paris 14, France