Funding for this research was provided by:
Lifespan/Tufts/Brown Center for AIDS Research (P30AI042853)
National Natural Science Foundation of China (81302479)
Article History
First Online: 4 September 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Survey and Behavioral Research Ethics Committee, The Chinese University of Hong Kong, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.