The controlled clinical trial: medicine's most powerful tool.
D035061:Control Groups; D013502:General Surgery; D006664:History; D006805:Human Experimentation; D006801:Humans; D004364:Pharmaceutical Preparations; D010919:Placebos; D011897:Random Allocation; D012107:Research Design; D012306:Risk; D018570:Risk Assessment
Biomedical and Behavioral Research; Popular Approach/Source