Observational studies and randomized trials.
Smith
R P
RP
Meier
P
P
D000319:Adrenergic beta-Antagonists / Q000627:therapeutic use*; D015982:Bias; D016022:Case-Control Studies; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D016896:Treatment Outcome
D000319:Adrenergic beta-Antagonists