Jassim, Nizar, and Saba Majeed. “The Assessment of Knowledge in Sample of Iraqi Patients With Ankylosing Spondylitis”. Revmatologiia (Bulgaria) 28, no. 1 (June 16, 2020): 31-40. Accessed October 24, 2020. http://www.rheumatologybg.org/journal/index.php?journal=revmatologiia&page=article&op=view&path[]=66.