Peixoto, M J, T Gonzales, H Spinola, A R Couto, M Gantes Mora, A Brehm, M R Santos, F Garrett, and J Bruges Armas. 2005. “HLA-B27 Polymorphism and Spondyloarthropathies”. Acta Médica Portuguesa 18 (4). Lisbon, Portugal:283-93. https://doi.org/10.20344/amp.1031.