[How effective are drugs?--controlled drug trials are needed].
Pentikäinen
P J
PJ
D018849:Controlled Clinical Trials as Topic; D017277:Drug Approval; D004358:Drug Therapy / Q000592:standards*; D019317:Evidence-Based Medicine; D006801:Humans; D011364:Professional Practice; D012107:Research Design / Q000592:standards; D016896:Treatment Outcome
Tehoavatko lääkkeet?--kontrolloituja lääketutkimuksia tarvitaan.