Funding for this research was provided by:
National Key Research and Development Program of China (2017YFE0103800)
National Institute of Allergy and Infectious Diseases (1R01AI114310, 5P30AI050410, P30AI027763)
Fogarty International Centre (1D43TW009532)
Bill and Melinda Gates Foundation (BMGF-OPP1120138)
National Center for Advancing Translational Sciences (UL1TR001111)
Medical Scientific Research Foundation of Guangdong Province of China (A2018508)
Received: 28 November 2018
Accepted: 11 July 2019
First Online: 22 July 2019
Ethics approval and consent to participate
: Ethics review committees in China (Guangdong Provincial Center for Skin Diseases and STI Control) and the United States (University of North Carolina at Chapel Hill and the University of California, San Francisco) approved the study prior to launch. All participants agreed to informed consent and signed the inform consent prior to the survey. All the participants are Chinese, and they resided in China, and this study did get ethical approval from a Chinese IRB committee.
: Not Applicable.
: The authors declare that they have no competing interests.