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Ziegler A, Verdolini Abbott K, Johns M, Klein A, Hapner ER.Ziegler A, et al.Laryngoscope. 2014 Aug;124(8):1869-76. doi: 10.1002/lary.24548. Epub 2014 Jan 29.Laryngoscope. 2014.PMID: 24375313Clinical Trial.