@inbook{1156109048, author={Michael H. Crawford and Mandar Aras and José M. Sanchez}, title={Variant or Prinzmetal’s Angina}, booktitle={Quick Dx & Rx: Cardiology}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2018}, url={accesscardiology.mhmedical.com/content.aspx?aid=1156109048} }