. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Ultrasound Med Biol. 2013 Dec 7;40(2):341–350. doi: 10.1016/j.ultrasmedbio.2013.09.016
© 2013 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.