Funding for this research was provided by:
National Natural Science Foundation of China (81673031, 81872510)
Guangzhou Municipal Science and Technology (201704020161)
Received: 14 February 2019
Accepted: 30 September 2019
First Online: 6 November 2019
Ethics approval and consent to participate
: The protocol of this retrospective study was approved by the ethics committee of Guangdong Provincial People’s Hospital.
: Not applicable.
: The authors declare that they have no competing interests.