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• Specialized in systematic critiques: Cochrane Library Plus and NHS Centre database for Reviews and Dissemination (HTA, DARE and NHSEED).

• General databases: Medline, Pubmed and Embase.

• On-going scientific trials and research venture databases: Clinical Trials Registry (National Institutes of Health, EE.UU.) and Health Services Research Projects in Progress.

• General web looking engines: Scholar Google.