Funding for this research was provided by:
National Natural Science Foundation of China (81802918)
The science and technology planning project of Jiangmen (2017A4016,2015068)
Received: 14 November 2019
Accepted: 3 March 2020
First Online: 3 April 2020
Ethics approval and consent to participate
: The study was approved by the Jiangmen Central Hospital and the requirement for signed informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.