METHODS
PubMed, Scopus, and Ovid were searched for English-language articles. The search terms “covid”, “COVID-19”, “SARS-CoV-2”,“coronavirus”, “bronchoscopy”, “bronchoscope”, “esophagoscopy”, “laryngoscopy” were used to construct the search function. Literature published by organizations online which was not peer-reviewed was also included in this study. The same search terms used in databases were used in the Google search engine. Guidelines relevant to bronchoscopy in regard to COVID-19 were included. Unpublished documents from the author’s affiliated institutions were also reviewed.