Online ACOG PublicationsACOGObstetrics & Gynecology: September 2019 - Volume 134 - Issue 3 - p e64-e70 doi: 10.1097/AOG.0000000000003399 Free Metrics This document has been withdrawn or is no longer available Please contact the Resource Center at the American College of Obstetricians and Gynecologists ([email protected]; 202-863-2518) for further information Current clinical guidance from ACOG is available online at https://www.acog.org/clinical© 2019 by the American College of Obstetricians and Gynecologists. Published by Wolters Kluwer Health, Inc. All rights reserved.View full article text