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Clinical Trial Phases: What Happens in Phase 0, I, II, III, and IV
Step 3: Clinical Research | FDA - U.S. Food and Drug Administration
Phases of clinical research - Wikipedia
Planning and Conducting Clinical Research: The Whole Process
The Basics | National Institutes of Health (NIH)
Types and Phases of Clinical Trials - American Cancer Society
The Clinical Trials Process - Duke Health
How Do Clinical Trials Work? - NCI - National Cancer Institute
Clinical Trials - How Clinical Trials Work - NHLBI, NIH
What Does the “Phase” of a Clinical Trial Mean?