Chen, Jun
Lin, Chunqing
Cao, Wei
Wu, Zunyou
Li, Li
Funding for this research was provided by:
National Institute on Drug Abuse of the National Institutes of Health (R01DA033130)
National Institute of Mental Health of the National Institutes of Health (P30MH058107)
Article History
Received: 14 November 2019
Accepted: 8 January 2020
First Online: 4 February 2020
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 institutional research committee (the University of California Los Angeles and National Center for AIDS Prevention and Control, Chinese Center for Disease Control and Prevention) 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.