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Univ Cologne, Dept Otorhinolaryngol Head & Neck Surg, Clin Otorhinolaryngol Head & Neck Surg, D-50924 Cologne, Germany Univ Cologne, Dept Otorhinolaryngol Head & Neck Surg, Clin Otorhinolaryngol Head & Neck Surg, D-50924 Cologne, Germany