Randomized trials or population-based registries.
Bergqvist
D
D
Björck
M
M
Säwe
J
J
Troëng
T
T
D015982:Bias; D003627:Data Interpretation, Statistical; D006801:Humans; D011159:Population Surveillance / Q000379:methods*; D016032:Randomized Controlled Trials as Topic / Q000379:methods* / Q000706:statistics & numerical data; D012042:Registries / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D012107:Research Design