CLINICAL TRIAL A clinical trial is a research study to answer specific questions about vaccines or new therapies or new ways of using known treatments. Clinical tri
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| Language pair: | English |
| Definition / notes: | Phase I tests a new drug or treatment in a small group; Phase II expands the study to a larger group of people; Phase III expands the study to an even larger group of people; and Phase IV takes place after the drug or treatment has been licensed and marketed. (See Phase I, II, III, and IV Trials). |
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