Saliha Karatay, et al. “THE RELATIONSHIP OF RHEUMATOID ARTHRITIS AND ANKYLOSING SPONDYLITIS WITH HEPATITIS B VIRUS”. Archives of Rheumatology, vol. 18, no. 3, Sept. 2003, pp. 129-32, http://anadolupsikiyatri.net/index.php/pub/article/view/114.