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"Randomized Controlled Trials, Observational Studies, and the Hierarchy of Research Designs, Dr. John Concato et al., Yale University, New England Journal of Medicine. (2000)" icon

Randomized Controlled Trials, Observational Studies, and the Hierarchy of Research Designs, Dr. John Concato et al., Yale University, New England Journal of Medicine. (2000)

2000, Randomized Controlled Trials, Observational Studies, and the Hierarchy of Research Designs, Dr. John Concato et al., Yale University, New England Journal of Medicine, https://www.nejm.org/doi/full/10.1056/NEJM200006223422507, Copyright all rights reserved by the Massachusetts Medical Society [article]

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