. Author manuscript; available in PMC: 2014 Feb 1.
Published in final edited form as: Ultrasound Med Biol. 2012 Dec 17;39(2):211–225. doi: 10.1016/j.ultrasmedbio.2012.09.006
© 2012 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.