Funding for this research was provided by:
amfAR, The Foundation for AIDS Research
Medical Science and Technology Foundation of Guangdong Province (A2018459)
Text and Data Mining valid from 2019-02-14
First Online: 14 February 2019
Compliance with Ethical Standards
: We declare no competing interests.
: Ethics approval was obtained from the Ethics Review Boards of the Guangzhou Center for Disease Control and Prevention and the University of Pittsburgh (Protocol 15040542).