. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Ultrasound Med Biol. 2013 Nov 14;40(1):10.1016/j.ultrasmedbio.2013.09.006. doi: 10.1016/j.ultrasmedbio.2013.09.006
© 2013 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.