Funding for this research was provided by:
Natural Science Foundation of Guangdong Province (2018A030313077, 2016A030313215)
Science and Technology Program of Guangzhou (201904010440)
Received: 18 August 2019
Accepted: 20 December 2019
First Online: 16 January 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of the First Affiliated Hospital of Sun Yat-sen University. Written informed consent was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.