Yang, Yin
Wang, Lian-qun
Yao, Bo-chen
Guo, Zhi-gang
Article History
Received: 1 February 2020
Accepted: 22 May 2020
First Online: 29 May 2020
Ethics approval and consent to participate
: The research conformed to the Declaration of Helsinki, and it was authorized by the Human Ethics and Research Ethics Committees of the Tianjin Chest Hospital. Informed consent was obtained from all the participants.
: Not applicable.
: The authors declare that they have no competing interests.