Table 1.

Search strategy for protocol selection

“protocol[ti] AND random*”

Filter for “randomised trials” and time range

1. randomised controlled trial [pt] OR controlled randomised trial [pt] OR randomised [tiab] OR randomised [tiab] OR placebo [tiab] OR randomly [tiab] OR trial [tiab]

2. protocol [tiab]

3. systematic review OR meta-analysis [ti] OR meta analysis [ti] OR review [ti] OR Review [pt] OR Meta-Analysis [pt] OR Comment [pt] OR Letter [pt] OR Editorial [pt] OR News [pt]

4. #1 AND #2 NOT #3