. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Ultrasound Med Biol. 2013 Jul 9;39(10):1804–1811. doi: 10.1016/j.ultrasmedbio.2013.04.008
© 2013 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.