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Authors
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Funding
Funding for this research was provided by:
National Institute on Drug Abuse (2R01-DA029121-01A1)
National Institutes of Health (R21-DA039722-01A1)
Alternatives Research and Development Foundation
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Article History
Received: 20 October 2018
Accepted: 30 April 2019
First Online: 8 May 2019
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.
