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Published in final edited form as: Ultrasound Med Biol. 2008 Apr 16;34(9):10.1016/j.ultrasmedbio.2008.02.007. doi: 10.1016/j.ultrasmedbio.2008.02.007
© 2008 World Federation for Ultrasound in Medicine and Biology. Published by Elsevier Inc. All rights reserved.