Funding for this research was provided by:
National Natural Science Foundation of China (81873519, 81730054)
the Ministry of Health of P.R. China (201002012)
Research Project of PLA (BLJ18J007)
Received: 6 December 2019
Accepted: 14 July 2020
First Online: 27 July 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Ethics Committee of Xinqiao Hospital, Army Medical University (number: 2012014; approved May 9, 2012). Each participant provided written informed consent, and our study conformed to the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.