CITATIONS

Term: ankylosing spondylitis
Http://: http://www.mayoclinic.com/health/ankylosing-spondylitis/DS00483
Http://: http://www.nlm.nih.gov/medlineplus/ency/article/000420.htm
Http://: http://en.wikipedia.org/wiki/Ankylosing_spondylitis
Http://: http://www.spondylitis.org/about/as.aspx