Funding for this research was provided by:
International Cooperation Project of Guangzhou Science and Technology Program (2016201604030021)
National Grant Program on Key Infectious Disease (2014ZX10002002-002)
Text and Data Mining valid from 2018-11-10
Received: 17 April 2018
Accepted: 21 October 2018
First Online: 10 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethical Committee of the Sun Yat-sen University.
: Written informed consents were obtained from all subjects in this study.