[1] Canterbury Christ Church Univ, Inst Med Sci, Canterbury, England
[2] Ain Shams Univ, Community & Publ Hlth, Cairo, Egypt
[3] Ain Shams Univ, Rheumatol & Rehabil, Cairo, Egypt
[4] Assiut Univ, Rheumatol & Rehabil, Assiut, Egypt
[5] Tanta Univ, Rheumatol & Rehabil, Tanta, Egypt
[6] Benha Univ, Rheumatol & Rehabil, Banha, Egypt
[7] Alexandria Univ, Rheumatol Physcial Med & Rehabil, Alexandria, Egypt