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

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

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Clinical versus statistical considerations in the design and analysis of clinical research., , , and . Journal of clinical epidemiology, 51 (4): 305-7 (April 1998)2897<m:linebreak></m:linebreak>Comparacions múltiples.Randomized, controlled trials, observational studies, and the hierarchy of research designs., , and . The New England journal of medicine, 342 (25): 1887-92 (June 2000)2645<m:linebreak></m:linebreak>Tipus d&#039;estudis.