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Manuscripts discovered in Spain may be unpublished novels left behind by the Chilean author Roberto Bolaño, The Guardian of London reported, citing the Spanish newspaper La Vanguardia.
Firstly, there may be unpublished randomized controlled trials that are not included.
Likewise, there may be unpublished reports from other refugee organisations that were not included.
Where clinical data are used, they may be unpublished, or data generated on an equivalent device.
Although studies were selected by an exhaustive search of scientific and grey literature databases, there may be unpublished reports.
Other included studies may have measured but not reported outcomes that are included in this review, and there may be unpublished trials of peer support, so results have been downgraded for risk of reporting bias.
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There may also be unpublished trials that were not identified in our search.
However, there may well be unpublished reports, particularly those internal to health care providing organisations, and of a commercially sensitive nature, which provide further evidence.
Another consideration is that although the review has included several unpublished studies which we identified from published trial protocols, there may be other unpublished studies which have not been included but are relevant to the review; hence this review may not have included all the potential literature.
The inclusion and exclusion criteria were applied by only the first author, and there may be other unpublished studies of study publication bias or outcome reporting bias that were not located by the search, however contact with experts in the field reduces the likelihood of these issues introducing bias.
A trial may have been unpublished not just to hide lesser effects but because its quality was poor — because patients were enrolled incorrectly, groups were assigned improperly or the cohort sizes were too small.
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CEO of Professional Science Editing for Scientists @ prosciediting.com