. Author manuscript; available in PMC: 2010 Sep 27.
Published in final edited form as: Ultrasound Med Biol. 2008 Apr 18;34(9):1421–1433. doi: 10.1016/j.ultrasmedbio.2008.01.016
© 2008 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.