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Schofield M, Calhoun KH.Schofield M, et al. Among authors: calhoun kh.Otolaryngol Clin North Am. 2011 Jun;44(3):591-601, viii. doi: 10.1016/j.otc.2011.03.002.Otolaryngol Clin North Am. 2011.PMID: 21621047Review.