Funding for this research was provided by:
National Natural Science Foundation of China (81373051)
Received: 18 July 2019
Accepted: 9 January 2020
First Online: 14 January 2020
Ethics approval and consent to participate
: The study protocol was approved by the Animal Ethics and Welfare Committee of the School of Public Health, Southern Medical University and adhered to the guidelines for the Rules for the Implementation of Laboratory Animal Medicine (1998) from the Ministry of Health, China. All surgical procedures were performed under anesthesia in efforts to minimize suffering. Endangered or protected species were not involved in this study. Healthy adults participated after signing an informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.