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Of course, many bibliographic databases are generalist and interrogating them with a given keyword yields articles published in many journals whatever their degree of generality and their Impact Factor.
Many bibliographic databases are not well designed for systematic reviews that have geographical focus on LMICs, often about international development, for several reasons.
We chose to sample journals listed in the Cochrane CENTRAL database because this includes a wider range of sources than many bibliographic databases (such as Medline) and mainly comprises journals that publish controlled clinical trials.
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For instance, abstracts are often freely available through many bibliographic and referencing databases such as Pub Med, but strict interpretation of the law would suggest their duplication requires permission as they arguably represent a substantial part of the body of work.
However, this material captures not only the developmental history of the discipline, but also some of the knowledge that is missing from the formal peer-reviewed bibliographic databases for many different reasons and which can add value to future research and current practice.
Figuring out how many documents are indexed in traditional bibliographic databases, such as Thomson Reuters's Web of Science and Elsevier's Scopus, is a piece of cake a simple query is all it takes.
CENTRAL includes citations to reports of controlled trials that might not indexed in MEDLINE, EMBASE or other bibliographic databases; citations published in many languages; and other sources that are difficult to access[ 19].
Oh et al. [ 5] demonstrate that any query string "ehealth" or "e-health" is likely to turn up bibliographic databases with materials that contain as many definitions as there are articles.
It was necessary to include these terms because pilot work suggested that they may also be used by bibliographic databases to classify qualitative studies, even though many qualitative researchers might not choose to use such terms to describe their work.
Retrieving relevant studies on off-label drug use might be influenced by many mechanisms such as low quality of off-label use reporting and poor indexing in bibliographic databases.
The library has preserved many of its digital resources, including the full-text databases of the Thomas system for legislative information and its own bibliographic databases.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com