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Boyd J, Buick JM.Boyd J, et al. Among authors: buick jm.Phys Med Biol. 2007 Oct 21;52(20):6215-28. doi: 10.1088/0031-9155/52/20/009. Epub 2007 Oct 1.Phys Med Biol. 2007.PMID: 17921581Free article.