Muhammad, Sardar, Amer Fakhr, Muhammad Adnan Manzar, Farzana Hakim, Taimoor Ashraf Khan, and Bilal Ahmad. “FREQUENCY OF HUMAN LEUKOCYTE ANTIGEN B27(HLA-B27) IN CLINICALLY DIAGNOSED ANKYLOSING SPONDYLITIS; A STUDY OF 100 CASES”. Pakistan Armed Forces Medical Journal 69, no. 6 (December 18, 2019): 1194–98. Accessed October 4, 2023. https://pafmj.org/index.php/PAFMJ/article/view/3632.