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Stratified Randomization

Stratified Randomization

There are four phases in testing new drugs in the United States. It begins by checking for safety (I), checking for efficacy (II), confirming the findings in large scale populations (III), and testing long-term effects in diverse patient population (IV).

There are four phases in testing new drugs in the United States. It begins by checking for safety (I), checking for efficacy (II), confirming the findings in large scale populations (III), and testing long-term effects in diverse patient population (IV).

Image result for stages of cultural identity development

Image result for stages of cultural identity development

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