[Observation studies are essential in many medical questions. But there is a risk of systemic errors].
thelander@sbu.se
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Thelander
D016022:Case-Control Studies; D015331:Cohort Studies; D018849:Controlled Clinical Trials as Topic / Q000592:standards; D003627:Data Interpretation, Statistical; D019317:Evidence-Based Medicine; D006801:Humans; D015588:Observer Variation; D016032:Randomized Controlled Trials as Topic / Q000592:standards; D012306:Risk