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Chen HC, Tsai PY, Huang HH, Shih HH, Wang YY, Chang CH, Sun YN.Chen HC, et al. Among authors: tsai py.Ultrasound Med Biol. 2012 May;38(5):811-23. doi: 10.1016/j.ultrasmedbio.2012.01.025. Epub 2012 Mar 16.Ultrasound Med Biol. 2012.PMID: 22425377