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. 2018 Feb 22;2018(2):MR000013. doi: 10.1002/14651858.MR000013.pub6

Comparison 27. E–Study‐related questionnaire + trial invitation vs trial invitation (GRADE: moderate).

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1 Participants recruited 1 2393 Risk Difference (M‐H, Fixed, 95% CI) 0.05 [0.02, 0.08]