Funding for this research was provided by:
Major Projects of Special Development Funds in Zhangjiang National Independent Innovation Demonstration Zone, Shanghai (ZJ2017-ZD-012)
Text and Data Mining valid from 2020-03-31
Received: 16 July 2019
Accepted: 17 March 2020
First Online: 31 March 2020
Ethical approval and consent to participate
: This study was approved by the Ethics Committee of Linfen People’s Hospital, Jincheng People’s Hospital, Peace Hospital Affiliated with Changzhi Medical College, The General Hospital of Tisco Affiliated with Shanxi Medical University, Hebei General Hospital, and General Hospital of Datong Coal Mine Group Co., Ltd. Informed consent was obtained from each individual for the study.
: Informed consent was obtained from all participants for publication.
: The authors declare that they have no competing interests.