“Evaluation of Apelin, and Tartrate-Resistant Acid Phosphatase-5b in Ankylosing Spondylitis Male Patients With and Without Osteoporosis”. Iraqi Journal of Science, vol. 60, no. 3, Mar. 2019, pp. 426-31, https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/672.