Iyoob Suzanne D, Tsai Anthony, Ruchelli Eduardo D, Coleman Beverly G, Wilson R Douglas
Ultrasound Department, Hospital of the University of Pennsylvania, Ground Dulles Building, Philadelphia, PA 19104 USA.
J Ultrasound Med. 2006 Nov;25(11):1495-8. doi: 10.7863/jum.2006.25.11.1495.