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Contributors All authors of this research contributed in a significant way to the manuscript and have read and approved the final manuscript. Authors had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Funding This investigation was supported in part by funds provided for medical and biological research by the State of Washington Initiative Measure No. 171 (WSU Alcohol and Drug Abuse Research Program) and by funds from the Department of Justice CKWX0042, PI: John Roll (WSU Program of Excellence in the Addictions)..
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.