. Author manuscript; available in PMC: 2014 Feb 6.
Published in final edited form as: Ultrasound Med Biol. 2009 Aug 3;35(10):1615–1628. doi: 10.1016/j.ultrasmedbio.2009.05.011
Copyright © 2009 World Federation for Ultrasound in Medicine & Biology Printed in the USA. All rights reserved