@inbook{1151031201, author={Ana Monteagudo and Andrea Kaelin Agten and Andrei Rebarber and Ilan E. Timor-Tritsc}, editor={Fleischer, Arthur C. and Abramowicz, Jacques S. and Gonçalves, Luis F. and Manning, Frank A. and Monteagudo, Ana and Timor, Ilan E. and Toy, Eugene C.}, title={Ultrasound of the Fetus at 11 to 18 Weeks}, booktitle={Fleischer's Sonography in Obstetrics and Gynecology: Textbook and Teaching Cases, 8e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2017}, url={obgyn.mhmedical.com/content.aspx?aid=1151031201} }