Funding for this research was provided by:
National Institute on Drug Abuse (R01 DA045596, R21 DA041903, R01 DA039942)
National Institute on Drug Abuse (R21 DA045597)
Center for AIDS Research, University of North Carolina at Chapel Hill (T32 DA007244)
National Institute on Drug Abuse (R01 DA033760)
Japan Society for the Promotion of Science (17F17388)
National Institute of Allergy and Infectious Diseases (R01 AI128864)
National Institute of Allergy and Infectious Disease (R01 AI091526)
Received: 7 January 2019
Accepted: 11 July 2019
First Online: 1 August 2019
Compliance with Ethical Standards
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.
: The authors declare that they have no conflicts of interest.