@article{ferri-de-barros_alencar_berchielli_castelhano junior_2011,  title={Headache among medical and psychology students},  volume={69},  ISSN={0004-282X},  url={https://doi.org/10.1590/S0004-282X2011000400018},  DOI={10.1590/S0004-282X2011000400018},  number={3},  journal={Arquivos de Neuro-Psiquiatria},  publisher={Academia Brasileira de Neurologia - ABNEURO},  author={Ferri-de-Barros, João Eliezer and Alencar, Mauricio José de and Berchielli, Luis Felipe and Castelhano Junior, Luis Carlos},  year={2011},  month={Jun},  pages={502–508} }