RT Journal Article SR Electronic T1 Unclassified early arthritis is often spondyloarthritis. JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1393 OP 1393 VO 30 IS 6 A1 Kalevi Kaarela A1 Juha K Jantti A1 Kari Lehtinen YR 2003 UL http://www.jrheum.org/content/30/6/1393.1.abstract AB