Funding for this research was provided by:
Zhuhai City, Guangdong Province Department of Science and Technology (20191210E030076)
Text and Data Mining valid from 2020-02-19
Received: 13 October 2019
Accepted: 20 January 2020
First Online: 19 February 2020
Ethics approval and consent to participate
: The study protocol was designed and approved by the ethical committee of the Fifth Affiliated Hospital of Sun Yat-Sen University.
: Informed consent was obtained from all patients.
: The authors declare that they have no competing interests.