Level of evidence reviews: three years of progress.
Eric J
EJ
Ashman
Gary S
GS
Gronseth
D019317:Evidence-Based Medicine / Q000592:standards / Q000639:trends*; D006801:Humans; D017410:Practice Guidelines as Topic / Q000592:standards; D016032:Randomized Controlled Trials as Topic / Q000592:standards / Q000639:trends