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Randomized, controlled trials, observational studies, and the hierarchy of research designs.

, , и . The New England journal of medicine, 342 (25): 1887-92 (июня 2000)2645<m:linebreak></m:linebreak>Tipus d&#039;estudis.
DOI: 10.1056/NEJM200006223422507

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Heinrich J J Mieschendahl

Norbert J J Bock

J J M Ramakers

Ulrich J J Longerich

Ulrich J J Longerich

 

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Randomized, controlled trials, observational studies, and the hierarchy of research designs., , и . The New England journal of medicine, 342 (25): 1887-92 (июня 2000)2645<m:linebreak></m:linebreak>Tipus d&#039;estudis.A simulation study of the number of events per variable in logistic regression analysis, , , , и . Journal of Clinical Epidemiology, 49 (12): 1373--1379 (1996)