Mehmet Adam, Berrin Leblebici, Alper Nabi Erkan, Selda Bağış, and Mahmut Nafiz Akman. 2008. “Ankylosing Spondylitis and Postural Balance”. Archives of Rheumatology 23 (3):087-090. http://anadolupsikiyatri.net/index.php/pub/article/view/256.