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Schabel MC, Morrell GR.Schabel MC, et al. Among authors: morrell gr.Phys Med Biol. 2009 Jan 7;54(1):N1-8. doi: 10.1088/0031-9155/54/1/N01. Epub 2008 Dec 5.Phys Med Biol. 2009.PMID: 19060359