@inbook{1166535352, author={Heather A. Heaton}, editor={Tintinalli, Judith E. and Ma, O. John and Yealy, Donald M. and Meckler, Garth D. and Stapczynski, J. Stephan and Cline, David M. and Thomas, Stephen H.}, title={Ectopic Pregnancy and Emergencies in the First 20 Weeks of Pregnancy}, booktitle={Tintinalli's Emergency Medicine: A Comprehensive Study Guide, 9e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2020}, url={accessmedicine.mhmedical.com/content.aspx?aid=1166535352} }