In medicine, a clinical trial (synonyms: clinical studies, research protocols, medical research) is a research study.
To be ethical, they must involve the full and informed consent of participating human subjects. They are closely supervised by appropriate regulatory authorities. All interventional studies must be approved by an ethics committee (in the USA, this body is the Institutional Review Board) before permission is granted to run the trial.
More on [ Clinical trial ]

Long-Term, Low-Intensity Warfarin Therapy for the Prevention of Recurrent Venous Thromboembolism - Abstract of a New England Journal of Medicine article detailing the results of the PREVENT clinical trial. [Paid registration required to view full article]
Meta Description: [ Original Article from The New England Journal of Medicine -- Long-Term, Low-Intensity Warfarin Therapy for the Prevention of Recurrent Venous Thromboembolism ]
PREVENT (Prevention of Recurrent Venous Thromboembolism) Trial - Aims to answer the question: What is the best way to prevent the recurrence of blood clots in the legs and lungs? Features background information about thrombosis and its treatment plus information about the trial and patient eligibility.
Meta Description: [ Brigham and Womens Hospital focuses on patient care and the needs of patients and their families. BWH is a top 100 hospital as ranked by US News and World Report. ]
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