RT Journal Article SR Electronic T1 Early Spondyloarthritis in an HLA-B27-positive Monozygotic Twin Pair: A Highly Concordant Onset, Sites of Involvement, and Disease Course JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP 1464 OP 1466 VO 35 IS 7 A1 ULRICH WEBER A1 CHRISTIAN W.A. PFIRRMANN A1 RUDOLF O. KISSLING A1 C. RONALD MACKENZIE A1 MUHAMMAD A. KHAN YR 2008 UL http://www.jrheum.org/content/35/7/1464.2.abstract AB