Resource that provides patients, their family members, health care professionals, researchers, and the public with easy access to information on publicly and privately supported clinical studies on a wide range of diseases and conditions. Data change nightly. Maintained by the National Library of Medicine (NLM) at the National Institutes of Health (NIH). Information is provided and updated by the sponsor or principal investigator of the clinical study. Does not contain all the clinical studies conducted in the United States because not all studies are required by law to be registered (see FDAAA 801 Requirements for more information).