Funding for this research was provided by:
National Natural Science Foundation of China (81603435, 81601403)
Guangdong Technology Project (2016A020215043)
Text and Data Mining valid from 2019-03-11
Received: 6 November 2018
Accepted: 20 February 2019
First Online: 11 March 2019
Ethics approval and consent to participate
: Ethics committee of the First Affiliated Hospital of Sun Yat-sen University approved the research. This work was conducted in compliance with the Declaration of Helsinki principles.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.