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Strehl MA, Scheich M, Ott I, Müller-Hermelink HK, Hagen R, Völker HU.Strehl MA, et al. Among authors: hagen r.Laryngorhinootologie. 2009 Mar;88(3):186-90. doi: 10.1055/s-0028-1102933. Epub 2008 Dec 8.Laryngorhinootologie. 2009.PMID: 19065497German.