Article History
Received: 17 August 2020
Accepted: 11 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This was a retrospective observational study using anonymous patient data. The protocol has been approved by the Department of Medical Affairs and the Ethics committee of The Second Affiliated Hospital of Xiamen Medical College, which gave the permission to access all medical record of patients. Contact with Prof. Ming-yao Ke, the corresponding author, via e-mail (651296060@qq.com) is requested should any additional information be needed. All patients signed written informed consent before performing rigid bronchoscopy. Patients were not contacted or directly impacted by study participation, thus obtaining informed consent was not applicable.
: Not applicable.
: The authors declare that they have no competing interests.