Article Text
PostScript
Letter
Negative trials as a compass
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Footnotes
Contributors BCHT contributed, revised, approved, and is accountable for the final manuscript. SFA contributed, revised, approved, and is accountable for the final manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.