H. Shaukat, A. Fakhr, Z. Tasleem, G. Abbas Niazi, A. Khurshid, and F. Hakim, “Comparison of Clinical Features in Hla-B27 Positive and Negative Patients with Axial Spondyloarthritis”, Pak Armed Forces Med J, vol. 75, no. 6, pp. 1203–1206, Dec. 2025, doi: 10.51253/pafmj.v75i6.10379.