Siddiqui Nazema Y, Thomas Samantha M
Department of Obstetrics and Gynecology, Duke University School of Medicine, Durham, North Carolina Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, North Carolina.
Obstet Gynecol. 2014 Oct;124(4):839. doi: 10.1097/AOG.0000000000000488.