Funding for this research was provided by:
Natural Science Foundation of Shenzhen (JCYJ20180305163407913, KQJSCX20180328093434771)
Medical Foundation of Guangdong (A2018308)
Received: 9 October 2019
Revised: 3 March 2020
Accepted: 10 March 2020
First Online: 19 March 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of Shenzhen University and followed the tenants of the Declaration of Helsinki. Informed consent to participate in the study was obtained from the participants.
: Not applicable.
: The authors declare that they have no competing interests.