Funding for this research was provided by:
National Natural Science Foundation of China (81773455, 81302448)
Received: 27 March 2019
Accepted: 30 October 2019
First Online: 5 December 2019
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and all procedures involving human subjects were approved by the Ethics Committee of Anhui Medical University. Written informed consent was obtained from all subjects. We attest that we have obtained appropriate permissions and paid any required fees for use of copyright protected materials.
: Not applicable.