Funding for this research was provided by:
National Natural Science Foundation of China (81472094)
Received: 17 July 2019
Accepted: 10 October 2019
First Online: 27 December 2019
Ethics approval and consent to participate
: This study has been approved by the Ethics Committee of Chinese PLA General Hospital. Written consent was obtained from all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.