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  1. clinicaltrials.gov
    https://clinicaltrials.gov

    ClinicalTrials.gov

  2. nih.gov
    https://clinicalstudies.info.nih.gov

    NIH Clinical Center: Search the Studies

  3. nih.gov
    https://www.ncbi.nlm.nih.gov/books/NBK390304

    In brief: What types of studies are there? - InformedHealth.org

  4. nih.gov
    https://www.nih.gov/health-information/nih...

    Finding a Clinical Trial | National Institutes of Health (NIH)

  5. nih.gov
    https://www.nia.nih.gov/health/clinical-trials-and...

    What Are Clinical Trials and Studies? - National Institute on Aging

  6. researchgate.net
    https://www.researchgate.net

    ResearchGate | Find and share research

  7. cancer.gov
    https://www.cancer.gov/research/participate/clinical-trials

    Clinical Trials Information - NCI - National Cancer Institute

  8. mayo.edu
    https://www.mayo.edu/research/clinical-trials/about-clinical-studies

    About Clinical Studies - Clinical Trials - Mayo Clinic Research

  9. researchmatch.org
    https://www.researchmatch.org

    ResearchMatch

  10. nih.gov
    https://www.nimh.nih.gov/health/trials

    Clinical Trials – Information for Participants - NIMH