[1] Canterbury Christ Church Univ, Canterbury, Kent, 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] Benha Univ, Rheumatol & Rehabil, Banha, Egypt
[6] Zagazig Univ, Rheumatol & Rehabil, Zagazig, Egypt
[7] Cairo Univ, Rheumatol, Cairo, Egypt
[8] Tanta Univ, Rheumatol & Rehabil, Tanta, Egypt
[9] Fayoum Univ, Rheumatol & Rehabil, Al Fayyum, Egypt
[10] Cairo Univ, Rheumatol & Rehabil, Cairo, Egypt
[11] Mansoura Univ, Rheumatol & Rehabil, Mansoura, Egypt
[12] Minia Univ, Rheumatol & Rehabil Dept, Al Minya, Egypt
[13] Alexandria Univ, Ophthalmol Dept, Alexandria, Egypt
[14] Suez Canal Univ, Lecturer Rheumatol & Rehabil, Ismailia, Egypt