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Crocker PR, McMillan SJ, Richards HE.Crocker PR, et al.Ann N Y Acad Sci. 2012 Apr;1253:102-11. doi: 10.1111/j.1749-6632.2011.06449.x. Epub 2012 Feb 21.Ann N Y Acad Sci. 2012.PMID: 22352893Review.