Departments: Letters to the EditorMifepristone Antagonization With Progesterone to Prevent Medical Abortion: A Randomized Controlled TrialButterfield-Kalk, C. R. MDAuthor Information San Antonio, Texas Financial Disclosure The author did not report any potential conflicts of interest. Obstetrics & Gynecology: April 2020 - Volume 135 - Issue 4 - p 970 doi: 10.1097/AOG.0000000000003786 Buy Corresponding Article Metrics Corresponding Article In Reply Creinin, Mitchell D.; Hou, Melody Y.; Dalton, Laura; Steward, Rachel; Chen, Melissa J. Obstetrics & Gynecology. 135(4):970-971, April 2020. © 2020 by the American College of Obstetricians and Gynecologists. Published by Wolters Kluwer Health, Inc. All rights reserved.