@article{helman_cançado_olivatto_2011,  title={Incidence of alloimunization in sickle cell disease: experience of a center in São Paulo},  volume={9},  ISSN={1679-4508},  url={https://doi.org/10.1590/S1679-45082011AO2003},  DOI={10.1590/S1679-45082011AO2003},  number={2},  journal={einstein (São Paulo)},  publisher={Instituto Israelita de Ensino e Pesquisa Albert Einstein},  author={Helman, Ricardo and Cançado, Rodolfo Delfini and Olivatto, Cristina},  year={2011},  month={Apr},  pages={160–164} }