[1] Cairo Univ, Fac Med, Rheumatol Dept, Cairo, Egypt
[2] Beni Suef Univ, Fac Med, Internal Med Dept, Rheumatol Unit, Bani Suwayf, Egypt
[3] Cairo Univ, Fac Med, Internal Med Dept, Rheumatol Unit, Cairo, Egypt
[4] Assiut Univ, Fac Med, Rheumatol Dept, Asyut, Egypt
[5] Tanta Univ, Internal Med Dept, Rheumatol Unit, Tanta, Egypt
[6] Al Azhar Univ, Fac Med, Rheumatol Dept, Asyut, Egypt
[7] Minia Univ, Fac Med, Rheumatol Dept, Al Minya, Egypt
[8] Ain Shams Univ, Fac Med, Internal Med Dept, Rheumatol Unit, Cairo, Egypt
[9] Benha Univ, Fac Med, Rheumatol Dept, Banha, Egypt
[10] Menoufiya Univ, Internal Med Dept, Rheumatol Unit, Menoufia, Egypt
[11] Helwan Univ, Fac Med, Pediat Rheumatol Dept, Cairo, Egypt
[12] Tanta Univ, Fac Med, Rheumatol Dept, Tanta, Egypt
[13] Mansoura Univ, Fac Med, Rheumatol Unit, Internal Med Dept, Mansoura, Egypt
[14] Zagazig Univ, Fac Med, Rheumatol Dept, Zagazig, Egypt
[15] Alexandria Univ, Fac Med, Rheumatol Dept, Alexandria, Egypt
[16] Mansoura Univ, Fac Med, Rheumatol Dept, Mansoura, Egypt
[17] Alexandria Univ, Fac Med, Rheumatol Unit, Internal Med Dept, Alexandria, Egypt
[18] Menoufiya Univ, Fac Med, Rheumatol Dept, Menoufia, Egypt
[19] Al Azhar Univ, Fac Med, Internal Med Dept, Rheumatol Unit, Cairo, Egypt
[20] Fayoum Univ, Fac Med, Rheumatol Dept, Al Fayyum, Egypt
[21] Beni Suef Univ, Fac Med, Rheumatol Dept, Bani Suwayf, Egypt
[22] Suez Canal Univ, Fac Med, Rheumatol Dept, Ismailia, Egypt
[23] Aswan Univ, Fac Med, Rheumatol Dept, Aswan, Egypt
[24] Med Univ Vienna, Dept Internal Med 3, Div Rheumatol, Vienna, Austria
[25] Egyptian Atom Energy Author EAEA, Rheumatol Unit, Internal Med Dept, Cairo, Egypt
[26] Sohag Univ, Fac Med, Rheumatol Dept, Sohag, Egypt
[27] Qena Luxor Hosp, Qena, Egypt
[28] Ain Shams Univ, Fac Med, Rheumatol Dept, Cairo, Egypt