@article{ruiz_azevedo_lupi_2012,  title={HLA-B27 frequency in a group of patients with psoriatic arthritis},  volume={87},  ISSN={0365-0596},  url={https://doi.org/10.1590/S0365-05962012000600004},  DOI={10.1590/S0365-05962012000600004},  number={6},  journal={Anais Brasileiros de Dermatologia},  publisher={Sociedade Brasileira de Dermatologia},  author={Ruiz, Danilo Garcia and Azevedo, Mário Newton Leitão de and Lupi, Omar},  year={2012},  month={Nov},  pages={847–850} }