Funding for this research was provided by:
Key Program of Medical Industry of Tianjin (No. 16KG132)
Key Research Program of Tianjin Chest Hospital
Text and Data Mining valid from 2018-08-29
Received: 25 June 2018
Accepted: 20 August 2018
First Online: 29 August 2018
Ethics approval and consent to participate
: This study was approved by Ethic Committees of the Tianjin Chest Hospital. The ethical code of the study was 2017-KY-004. All patients filled a written informed consent form before entering the study.
: Not applicable.
: The authors declare that they have no competing interests.
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