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Hemmer JD, Dean D, Vertegel A, Langan E 3rd, LaBerge M.Hemmer JD, et al. Among authors: vertegel a.Proc Inst Mech Eng H. 2008 Jul;222(5):761-72. doi: 10.1243/09544119JEIM371.Proc Inst Mech Eng H. 2008.PMID: 18756693