@inbook{1164351245, author={Danielle B. Cooper and E.J. Mayeaux, Jr.}, editor={Usatine, Richard P. and Smith, Mindy A. and Mayeaux, Jr., E.J. and Chumley, Heidi S.}, title={First Trimester Obstetrical Ultrasound}, booktitle={The Color Atlas and Synopsis of Family Medicine, 3e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={accessmedicine.mhmedical.com/content.aspx?aid=1164351245} }