Obstetrics: Management of Labor, Delivery, and the Puerperium
Bartha, J L.; Romero-Carmona, R; Martinez-del-Fresno, P; Comino-Delgado, R
Department of Obstetrics and Gynecology, University Hospital of Puerto Real, Puerto Real, Cadiz, Spain
Ultrasound Obstet Gynecol 2005;25:155–159
doi: 10.1097/01.ogx.0000172320.92549.b2