Randomized, controlled trials, observational studies, and the hierarchy of research designs (Q24670544)
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Current Data About Randomized, controlled trials, observational studies, and the hierarchy of research designs
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(P1932) N Shah
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(P577) Thursday, June 22, 2000

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(P1476) "Randomized, controlled trials, observational studies, and the hierarchy of research designs" (language: en)

(P2093) J Concato
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R I Horwitz
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External Links
(P356) 10.1056/NEJM200006223422507
(P698) 10861325
(P932) 1557642
(P3181) 174200