. Author manuscript; available in PMC: 2014 Feb 10.
Published in final edited form as: Ultrasound Med Biol. 2013 Jan;39(1):111–116. doi: 10.1016/j.ultrasmedbio.2012.08.012
© 2012 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.