Funding for this research was provided by:
Received: 5 August 2020
Accepted: 18 November 2020
First Online: 2 December 2020
Ethics approval and consent to participate
: The study was approved by the ethics committees of each institution and all the participants signed the informed consent both for their participation in the study and for the bronchoscopy.
: Not applicable.
: The authors declare that they have no competing interests.