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  1. Clinical trials take place in several phases. Phase 1 helps scientists understand the safety of a particular medicine or vaccine. Phase 2 begins to understand early efficacy. Phase 3 focuses on broader efficacy and dosing in preparation for health authority approval. And Phase 4 continues to monitor and collect data after a drug has been approved.
    www.pfizer.com/news/articles/anatomy_of_a_clinical_trial_the_purpose_people_and_phases_of_clinical_research
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