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PRISMA, Preferred Reporting Items for Systematic Literature Reviews and Meta-Analyses. †Comprises the records identified via Medline, Embase, ABI/INFORM, Adis Pharmacoeconomic & Outcomes News, Allied and Complementary Medicine, DH-DATA: Health Administration Medical Toxicology and Environmental Health, Gale Group Health Periodicals Database, Lancet Titles, and the New England Journal of Medicine.
