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In health care, a clinical trial is a comparison test of a medication or other medical treatment , versus a placebo , other medications or devices, or the standard medical treatment for a patient's condition.
To be ethical, researchers must obtain the full and voluntary informed consent of participating human subjects. If the subject is unable to consent for him/herself, researchers can seek consent from the subject's legally authorized representative. For a minor child this is typically a parent or guardian since as under the age of 18 cannot legally give consent to participate in a clinical trial.
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