Medline via EbscoSearch across multiple Ebsco databases including: Academic Search Premier, AgeLine, Alt HealthWatch, Biomedical Reference Collection, CINAHL, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, Cochrane Methodology Register, Database of Abstracts of Reviews of Effects, Health Technology Assessments, International Pharmaceutical Abstracts, MEDLINE, Mental Measurements Yearbook with Tests in Print, NHS Economic Evaluation Database, Nursing & Allied Health Collection, SPORTDiscus