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Of the 39 eligible ClinicalTrials.gov registrations whose primary completion was at least 12 months before the search, 18 (46%) had neither a report naming them nor posted results; among the masked trials Egger's test found no funnel-plot asymmetry (p = 0.7), and the PET estimate of the masked effect, allowing for small-study effects, was g −0.47 (95% CI −1.23 to 0.29). · sciencejournal.ai