Observational studies are just as effective as randomized clinical trials.
Wolfe
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RA
University of Michigan, Ann Arbor, MI 48103, USA. bobwolfe@umich.edu
D006801:Humans; D007674:Kidney Diseases / Q000628:therapy; D019370:Observation / Q000379:methods*; D015588:Observer Variation; D016032:Randomized Controlled Trials as Topic / Q000379:methods* / Q000592:standards; D006435:Renal Dialysis / Q000379:methods / Q000592:standards; D012107:Research Design