Funding for this research was provided by:
the Key Project of Scientific and Technological Support Plan of Tianjin in 2016 (16YFZCSY00800)
the Key Project of Healthcare Industry of Tianjin (15KG128)
Text and Data Mining valid from 2018-12-01
Received: 24 September 2018
Accepted: 3 December 2018
First Online: 12 December 2018
Ethics approval and consent to participate
: The study protocol has been approved by the Institutional Review Boards of Tianjin Chest Hospital and the study will be conducted in accordance with Declaration of Helsinki. Written informed consent is signed by all the participants. The study is also registered at ExternalRef removed (NCT03175952) on June 5, 2017.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.