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Hertel JE, Locay HR, Scarlata DS, Prathikanti R, Audhya PK.Hertel JE, et al.Mayo Clin Proc. 2006 Sep;81(9):1188-94. doi: 10.4065/81.9.1188.Mayo Clin Proc. 2006.PMID: 16970215Clinical Trial.