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Proceedings of the 1990 annual meeting of the German Society for Otorhinolaryngology — Head and neck surgery (Deutsche Gesellschaft für Hals-Nasen-Ohrenheilkunde, Kopf- und Hals-Chirurgie) 27–31 May 1990, Würzburg. Eur Arch Otorhinolaryngol 248, 153–189 (1991). https://doi.org/10.1007/BF00178927
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DOI: https://doi.org/10.1007/BF00178927