Johnson Katherine M, Shainker Scott A, Estroff Judy A, Ralston Steven J
Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA.
Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston, Massachusetts, USA.
J Ultrasound Med. 2017 Feb;36(2):449-451. doi: 10.7863/ultra.16.03055. Epub 2016 Dec 27.