Funding for this research was provided by:
the National Key Research and Development Program of China (2017YFE0103800)
National Institute of Allergy and Infectious Diseases (1R01AI114310)
Fogarty International Centre (1D43TW009532)
Received: 5 March 2018
Accepted: 23 October 2018
First Online: 30 October 2018
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.
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