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American Institute of Ultrasound in Medicine; American College of Radiology; Society of Radiologists in Ultrasound.American Institute of Ultrasound in Medicine, et al.J Ultrasound Med. 2011 Jan;30(1):151-5. doi: 10.7863/jum.2011.30.1.151.J Ultrasound Med. 2011.PMID: 21193719No abstract available.