RT Journal Article SR Electronic T1 Novel concepts of severity mechanisms in ankylosing spondylitis. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 2151 OP 2154 VO 28 IS 10 A1 A T Masi A1 J R King A1 R Burgos-Vargas YR 2001 UL http://www.jrheum.org/content/28/10/2151.abstract AB