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Chang L, Ho SY, Yeh SA, Lee TF, Chen PY.Chang L, et al.J Appl Clin Med Phys. 2015 Sep 8;16(5):457-468. doi: 10.1120/jacmp.v16i5.5558.J Appl Clin Med Phys. 2015.PMID: 26699316Free PMC article.
Chang L, Ho SY, Chui CS, Du YC, Chen T.Chang L, et al.Phys Med Biol. 2007 Feb 7;52(3):871-7. doi: 10.1088/0031-9155/52/3/023. Epub 2007 Jan 16.Phys Med Biol. 2007.PMID: 17228126