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Sun Y, Mauerhan DR, Honeycutt PR, Kneisl JS, Norton JH, Hanley EN Jr, Gruber HE.Sun Y, et al. Among authors: norton jh.BMC Musculoskelet Disord. 2010 Jan 28;11:19. doi: 10.1186/1471-2474-11-19.BMC Musculoskelet Disord. 2010.PMID: 20109188Free PMC article.