@inbook{1159613857, author={Michael Harrigan and Ana C. G. Felix}, editor={Tintinalli, Judith E. and Stapczynski, J. Stephan and Ma, O. John and Yealy, Donald M. and Meckler, Garth D. and Cline, David M.}, title={Cefalea}, booktitle={Tintinalli. Medicina de urgencias, 8e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2018}, url={accessmedicina.mhmedical.com/content.aspx?aid=1159613857} }