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ClinicalTrials.gov is a registry of federally and privately supported clinical trials conducted in the United States and around the world. ClinicalTrials.gov gives you information about a trial's purpose, who may participate, locations, and phone numbers for more details.
CenterWatch Clinical Trials Listing - Use this site to find a wealth of information about clinical research, including over 25,000 clinical trial listings (both industry and government sponsored), new drug therapies in research and those recently approved by the FDA.