@article{tonial_stechman neto_hummig_2014,  title={Chronic pain related to quality of sleep},  volume={12},  ISSN={1679-4508},  url={https://doi.org/10.1590/S1679-45082014AO2825},  DOI={10.1590/S1679-45082014AO2825},  number={2},  journal={einstein (São Paulo)},  publisher={Instituto Israelita de Ensino e Pesquisa Albert Einstein},  author={Tonial, Leandro Freitas and Stechman Neto, José and Hummig, Wagner},  year={2014},  month={Apr},  pages={159–163} }