Funding for this research was provided by:
National Natural Science Foundation of China (81201918)
Guangdong Provincial Science and Technology Planning Project (2014A020212626)
Text and Data Mining valid from 2018-04-24
Received: 14 December 2017
Accepted: 16 April 2018
First Online: 24 April 2018
Ethics approval and consent to participate
: This study was retrospective study and approved by the Ethics Review Committee of the First Affiliated Hospital of Sun Yat-sen University. All participants provided written informed consent to participate.
: The authors declare that they have no competing interests, and they consented to publish.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.