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Contributors CRB: conceived the manuscript and drafted it; CL devised Table 1. All authors contributed to multiple revisions & in contributing to intellectual content (CRB, MB and CL) and all signed off on the final version.
Funding CRB was funded by an Irish Research Counci-Marie Skłodowska-Curie Global Fellowship (CLN/2017/226); MB was funded by a National Institute of Health grant (T32DA016184); CL was funded by a Swiss National Science Foundation grant (P400PS_180730).
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Patient consent for publication Not required.
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