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Concato J., Shah N., Horwitz R.I. Randomized, controlled trials, observational studies, and the hierarchy of research designs. N Engl J Med 2000, 342:1887-1892.
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(2000)
N Engl J Med
, vol.342
, pp. 1887-1892
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Concato, J.1
Shah, N.2
Horwitz, R.I.3
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