Physicians' reports become a large part of the data in which phase of clinical trials?

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Phase 4 clinical trials, also known as post-marketing surveillance trials, occur after a drug has been approved for public use. During this phase, physicians' reports on the drug's performance, side effects, and long-term effects become a significant part of the data collected to ensure the drug's safety and efficacy in the general population.

Physicians' Reports Become a Large Part of the Data in Which