[1] Canterbury Christ Church Univ, Canterbury, Kent, England
[2] Kings Coll London, London, England
[3] Ain Shams Univ, Rheumatol Phys Med & Rehabil, Cairo, Egypt
[4] Darent Valley Hosp, Canterbury, Kent, England
[5] Benha Univ, Rheumatol & Rehabil, Banha, Egypt
[6] Ain Shams Univ, Community & Publ Hlth, Cairo, Egypt
[7] Tanta Univ, Rheumatol & Rehabil, Tanta, Egypt
[8] Cairo Univ, Rheumatol & Rehabil, Cairo, Egypt
[9] Alexandria Univ, Rheumatol Phys Med & Rehabil, Alexandria, Egypt
[10] Assiut Univ, Rheumatol & Rehabil, Assiut, Egypt