[1] Canterbury Christ Church Univ, Rheumatol, Medway Campus, Gillingham, England
[2] Natl Res Ctr, Rheumatol & Rehabil, Cairo, Egypt
[3] Cairo Univ, Fac Med Kasr Al Ainy, Gen Med, Cairo, Egypt
[4] Ain Shams Univ, Fac Med Community & Publ Hlth, Cairo, Egypt
[5] Tanta Univ, Fac Med, Rheumatol & Rehabil, Cairo, Egypt