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Authors
Han, Xing-Fen
Han, Chao
Jin, Feng
Wang, Jun-Li
Wang, Mao-Shui
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Article History
Received: 7 February 2021
Accepted: 18 May 2021
First Online: 25 May 2021
Declarations
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: This study was conducted in accordance with the Helsinki Declaration and approved by the Ethics Committee of Shandong Provincial Chest Hospital. Written informed consent was waived by the Ethical Committee of Shandong Provincial Chest Hospital due to retrospective nature of the study. In addition, the data collected was anonymized before its use.
: Not applicable.
: We declare that we have no conflict of interest.
