References
- van der Linden S, Valkenburg HA, Cats A. Evaluation of diagnostic criteria for ankylosing spondylitis. A proposal for modification of the New York criteria. Arthritis Rheum 1984;27:361–8.
- Höhler T, Hug R, Schneider PM, Krummenauer F, Gripenberg-Lerche C, Granfors K, . Ankylosing spondylitis in monozygotic twins: studies on immunological parameters. Ann Rheum Dis 1999;58:435–40.
- Brown MA, Kennedy LG, MacGregor AJ, Darke C, Duncan E, Shatford JL, . Susceptibility to ankylosing spondylitis in twins. Arthritis Rheum 1997;40:1823–8.
- Weber U, Pfirrmann CWA, Kissling RO, Mackenzie CR, Khan MA. Early spondyloarthritis in an HLA-B27-positive monozygotic twin pair: a highly concordant onset, sites of involvement, and disease course. J Rheumatol 2008;35;1464–6.
- Khan MA. Update on spondyloarthropathies. Ann Intern Med 2002;136:896–907.
- Cortes A, Hadler J, Pointon JP, Robinson PC, Karaderi T, Leo P, . Identification of multiple risk variants for ankylosing spondylitis through high-density genotyping of immune-related loci. Nat Genet 2013;45:730–8.
- Joishi R, Reveille JD, Brown MA, Weisman MH, Ward MM, Gensler LS, . Is there a higher genetic load of susceptibility loci in familial ankylosing spondylitis? Arthritis Care Res 2012;64:780–4.