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  1. Clinical Trial Phases: What Happens in Phase 0, I, II, III, and IV

  2. Step 3: Clinical Research | FDA - U.S. Food and Drug Administration

  3. Phases of clinical research - Wikipedia

  4. Planning and Conducting Clinical Research: The Whole Process

  5. The Basics | National Institutes of Health (NIH)

  6. Types and Phases of Clinical Trials - American Cancer Society

  7. The Clinical Trials Process - Duke Health

  8. How Do Clinical Trials Work? - NCI - National Cancer Institute

  9. Clinical Trials - How Clinical Trials Work - NHLBI, NIH

  10. What Does the “Phase” of a Clinical Trial Mean?