Funding for this research was provided by:
National Institute on Drug Abuse (R01DA037866, T32DA031099)
Received: 28 August 2018
Accepted: 30 October 2018
First Online: 3 December 2018
Ethics approval and consent to participate
: This research used publicly available data disseminated such that subjects cannot be identified and was deemed non-human subjects research by the Columbia University Medical Center institutional review board.
: This research is not human subjects research, and informed consent was not necessary.
: The authors declare that they have no competing interests.
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