. Author manuscript; available in PMC: 2013 Mar 1.
Published in final edited form as: Ultrasound Med Biol. 2012 Jan 21;38(3):443–453. doi: 10.1016/j.ultrasmedbio.2011.12.008
© 2011 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.