@article{saraiva_soares_santos_pereira_horta_2014,  title={Iron deficiency and anemia are associated with low retinol levels in
               children aged 1 to 5 years },  volume={90},  ISSN={0021-7557},  url={https://doi.org/10.1016/j.jped.2014.03.003},  DOI={10.1016/j.jped.2014.03.003},  number={6},  journal={Jornal de Pediatria},  publisher={Sociedade Brasileira de Pediatria},  author={Saraiva, Bárbara C.A. and Soares, Michele C.C. and Santos, Luana C.dos and Pereira, Simone C.L. and Horta, Paula M.},  year={2014},  month={Nov},  pages={593–599} }