Funding for this research was provided by:
Science and Technology Development Funds of Guangdong, China (2016A020220018)
Text and Data Mining valid from 2019-07-19
Received: 17 January 2019
Accepted: 12 June 2019
First Online: 19 July 2019
Ethics approval and consent to participate
: Procedures were reviewed and approved by the Committee of the Affiliated Hospital of Guangdong Medical University.
: Not applicable.
: The authors declare that they have no competing interests.