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| Clinical Trial, Phase III [Publication Type] Clinical Trial, Phase III | Clinical Trial, Phase III (PT) Work that is a report of a pre-planned, usually controlled, clinical study of the safety and efficacy of diagnostic, therapeutic, or prophylactic drugs, devices, or techniques after phase II trials. A large enough group of patients is studied and closely monitored by physicians for adverse response to long-term exposure, over a period of about three years in either the United States or a foreign country. |