@inbook{1159955557, author={John S. McDonald and Biing-Jaw Chen and Wing-Fai Kwan}, editor={DeCherney, Alan H. and Nathan, Lauren and Laufer, Neri and Roman, Ashley S.}, title={Obstetric Analgesia & Anesthesia}, booktitle={CURRENT Diagnosis & Treatment: Obstetrics & Gynecology, 12e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={obgyn.mhmedical.com/content.aspx?aid=1159955557} }