Nonrandom yet unbiased
- PMID: 2083302
Nonrandom yet unbiased
Comment on
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The validity of case-control studies with nonrandom selection of controls.Epidemiology. 1990 Jul;1(4):273-84. doi: 10.1097/00001648-199007000-00004. Epidemiology. 1990. PMID: 2083304
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