Table 4 Characteristics of four co-publications (journal version)

Authorship of co-publication

 Identical to Cochrane Methodology Review [32]

1 (25.0%)

 Same authors, different order [29, 30]

2 (50.0%)

 Authors added or removed [31]

1 (25.0%)

Co-publication timing

 Year after publication of Cochrane Methodology Review [29, 31, 32]

3 (75.0%)

 > 2 years after publication of Cochrane Methodology Review [30]

1 (25.0%)

Co-publication content compared to full Cochrane Methodology Review

 Short version^a [29, 30, 32]

3 (75.0%)

 Review summary^b [31]

1 (25.0%)

Number of included studies

 Same as Cochrane review [29, 30, 32]

3 (75.0%)

 Less than Cochrane review [31]

1 (25.0%)

Conclusions

 Same as Cochrane review [29,30,31,32]

4 (100.0%)