@inbook{1159953440, author={Ann-Marie Surette and Samantha M. Dunham}, editor={DeCherney, Alan H. and Nathan, Lauren and Laufer, Neri and Roman, Ashley S.}, title={Early Pregnancy Risks}, booktitle={CURRENT Diagnosis & Treatment: Obstetrics & Gynecology, 12e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={accessmedicine.mhmedical.com/content.aspx?aid=1159953440} }