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Physical Therapy

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Databases - Core

Databases - Secondary

Grey Literature

Grey Literature can be in either print or electronic formats and  is produced on all levels of government, academics, business and industry, but is not controlled by commercial publishers.

For many systematic reviews, most grey literature is found through searches of clinical trial registries and conference abstracts. 

Ben Goldacre's TED Talk: Bias, research misconduct and the importance of gray literature.