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Proceedings of the 1989 annual meeting of the German Society for Otorhinolaryngology — Head and Neck Surgery (Deutsche Gesellschaft für Hals-Nasen-Ohrenheilkunde, Kopf- und Hals-Chirurgie) 7–11 May 1989, Kiel. Arch Otorhinolaryngol 246, 433–469 (1989). https://doi.org/10.1007/BF00464304
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DOI: https://doi.org/10.1007/BF00464304