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Yao, Y., Sun, H. Reply to the letter “Nasal nitric oxide as biomarker in the evaluation and management of chronic rhino-sinusitis with nasal polyposis”. Eur Arch Otorhinolaryngol 274, 3819–3820 (2017). https://doi.org/10.1007/s00405-017-4712-7
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DOI: https://doi.org/10.1007/s00405-017-4712-7