It is run by the United States National Library of Medicine ( NLM ) at the National Institutes of Health .
Is the largest clinical trials database , currently holding registrations from over 230,000 trials from 195 countries in the world .
It is run by the United States National Library of Medicine ( NLM ) at the National Institutes of Health , and is the largest clinical trials database , currently holding registrations from over 230,000 trials from 195 countries in the world .