Finally, there may be databases inaccessible or unknown to us that cover foreign language and regional journals not indexed in MEDLINE and Embase.
However, some databases are inaccessible over time or poorly maintained/updated or even never used [12].
However, these databases are either inaccessible or highly restricted for information sharing.
Some employers and schools may provide you with websites they prefer or recommend, or give you access to credible, private databases or tools inaccessible to the public.
We did not search the HIMC database because it is inaccessible in Shandong University, Liverpool School of Topical Medicine and the University of Oslo.
However, such research requires expensive surveys and comprehensive databases that are usually inaccessible to planners and public-policy analysts.
However, the proprietary nature of Myriad's database meant that it was inaccessible to many researchers and clinicians, and testing by other laboratories who lack access to the database continues to produce higher VUS rates - a testament to the importance of data sharing and collation by all testing providers, and an example of the challenges created by proprietary databases [ 24].
Even more importantly, data alone without knowledge or integration into existing databases is bound to remain inaccessible and thus cannot be utilized by the broad scientific community.
Alternatively, these data remain buried in inaccessible forms in databases such as the Short Read Archive (SRA) [ www.ncbi.nlm.nih.gov/sra], DataDryad [ http://datadryad.org], or in spreadsheets on the authors' computers [ 4].
Possible limitations to this study could be that certain African journals were inaccessible on electronic databases, as they were published locally, were only available in the specific African country and not obtainable in South Africa.
Furthermore, until an explicit mapping to a given data source is introduced within a database interface, this data source is inaccessible or difficult to access, making the data practically non-existent to the users of these databases.
