@article{bigal_bigal_bordini_speciali_2001,  title={Prevalence and costs of headaches for the public health system in a town in the interior of the state of São Paulo},  volume={59},  ISSN={0004-282X},  url={https://doi.org/10.1590/S0004-282X2001000400005},  DOI={10.1590/S0004-282X2001000400005},  number={3A},  journal={Arquivos de Neuro-Psiquiatria},  publisher={Academia Brasileira de Neurologia - ABNEURO},  author={Bigal, Marcelo E. and Bigal, Janaína O.M. and Bordini, Carlos A. and Speciali, José G.},  year={2001},  month={Sep},  pages={504–511} }