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

  2. Phase 1 Clinical Trials—Goals and Testing - Verywell Health

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

  4. Phases of clinical research - Wikipedia

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

  6. What Does Phase 1, 2, and 3 of a Clinical Trial Mean?

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

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

  9. Phase 1 of Clinical Trials - Norton Healthcare

  10. Phases of clinical trials - Cancer Research UK