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While the search in this literature review was conducted using several key databases and references were cross-checked, there may be publications not incorporated in the review because of the MESH terms used and inclusion criteria utilized.
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Another important issue may be publication bias [ 37- 42].
Finally, there may be publication bias, so negative results are likely to be unpublished.
If studies are missing in areas of low statistical significance, then there may be publication bias.
A fourth limitation is that there may be publication bias in the voxel-based morphometry literature on ADHD.
The asymmetry suggests there may be publication bias with this evidence and further exploratory analyses were conducted.
In addition there may be publication bias in the literature as we found few studies presenting negative findings.
There may be publication bias of topical NSAID trials, the failure of small trials that show no effect to be published [ 59].
Finally, even though funnel plots for pooled estimates were relatively symmetrical (with one outlier i.e. study by Obatolu et al.[ 29]), there may be publication bias.
In education evaluation studies published, there may be publication bias: a wide variety of Internet-based interventions show effectiveness in medical education, perhaps leaving negative studies unpublished.
As such, it is understandable that there may be fewer publications from researchers in Asian countries.
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CEO of Professional Science Editing for Scientists @ prosciediting.com