Footnotes

• Contributors MOR led the writing of the manuscript’s first draft. ABS conceptualised the study and helped to draft and revise the manuscript. MJB helped to draft and revise the manuscript.

• Funding Research reported in this publication was supported by the National Institute On Drug Abuse of the National Institutes of Health under Award Number F31DA045424. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

• Competing interests None declared.

• Patient consent for publication Not required.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Data availability statement Data are available on request