Exact(1)
Some publishers, e.g. Pensoft [ 56], are already introducing publication in parallel formats (paper, PDF, HTML, XML).
Similar(58)
This may have introduced publication bias.
This has to be taken into account in meta-analyses, because this may introduce publication bias.
The review was limited to published studies, which could potentially introduce publication bias.
We excluded studies not available in English or Spanish language, which could introduce publication bias.
In this manner, it is possible we have introduced publication bias into this work.
Two reviews also mentioned that excluding conference proceedings could have introduced publication bias.
However, there is also evidence that some countries publish unusually high proportions of positive results (39), which would introduce publication bias.
Furthermore, the inclusion of only published articles may have introduced publication bias, because studies with positive results are more likely to be published than studies with negative findings.
The exclusion of the grey literature could have introduced publication bias, since studies with positive results are more likely to be published in peer-reviewed journals [ 58].
The search strategy to listed papers might introduce publication bias, because inconclusive studies might be less likely published in listed journals.
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