Funding for this research was provided by:
National Natural Science Foundation of China (81972856)
Received: 18 November 2019
Accepted: 5 January 2020
First Online: 9 January 2020
Ethics approval and consent to participate
: This study protocol was permitted by the Institutional Review Board of 302 Hospital of PLA (People’s Liberation Army) and was treated in accordance with Declaration of Helsinki. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.