RT Journal Article SR Electronic T1 The challenge of early diagnosis in ankylosing spondylitis. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 5 OP 7 VO 34 IS 1 A1 Finbar O'Shea A1 David Salonen A1 Robert Inman YR 2007 UL http://www.jrheum.org/content/34/1/5.abstract AB