. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: Ultrasound Med Biol. 2012 Sep 10;38(12):2198–2207. doi: 10.1016/j.ultrasmedbio.2012.07.020
© 2012 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.