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Nilssen EL, Wardrop P, El-Hakim H, White PS, Gardiner Q, Ogston S.Nilssen EL, et al. Among authors: wardrop p.J Laryngol Otol. 2002 Feb;116(2):108-11. doi: 10.1258/0022215021910041.J Laryngol Otol. 2002.PMID: 11827582Clinical Trial.