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article_metadata: 10.1177/21526567211030889
article_metadata: Allergy Rhinol (Providence)
article_metadata: 2021 Sep 6;12:21526567211030889.
article_metadata: endoscopic sinus surgery flexible bronchoscopy frontal sinus surgery frontoethmoidal cell minimal invasive surgery
article_metadata: CC BY-NC
article_metadata: https://pubmed.ncbi.nlm.nih.gov/34567829/
article_metadata: PMC8456616
article_metadata: 34567829
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article_metadata: 2021