Problems with using observational databases to compare treatments.
Byar
D P
DP
National Institutes of Health, Bethesda, MD 20892.
D015982:Bias; D003627:Data Interpretation, Statistical; D016208:Databases, Factual; D004812:Epidemiologic Methods; D006801:Humans; D007256:Information Systems; D013223:Statistics as Topic; D013812:Therapeutics