Ghi Tullio, Giunchi Susanna, Rossi Cristina, Pilu Gianluigi, Savelli Luca, Mollo Francesco, Pelusi Giuseppe
Department of Obstetrics and Gynecology, University of Bologna, Alma Mater Studiorum, Via Massarenti 13, 40100 Bologna, Italy.
J Ultrasound Med. 2005 May;24(5):727-31. doi: 10.7863/jum.2005.24.5.727.