Funding and Disclosures
Role of Funding Source: This work was supported by NIH Grants DA045364, DA031725, and DA045714. The NIH had no role in the writing of the manuscript or in the decision to submit the manuscript for publication.
Contributors: MAS and TP developed the idea. TP and JLS performed the review of the primary literature and wrote the initial drafts. JLS and MS collaborated on writing the final draft. All authors approved the final manuscript.
Acknowledgements: The authors wish to thank Dr. Karl Schmidt for comments on a previous version of this manuscript.
Conflict of Interest: No conflict declared.