National Institutes of Health (NIH) Clinical Trials www.clinicaltrials.gov
NIH is a registry and database of public and privately supported clinical trials conducted around the world.
Center Watch Clinical Trials http://www.centerwatch.com/clinical-trials/listings/
This site contains information related to clinical trials, such as a listing of more than 41,000 industry and government sponsored clinical trials as well as new drug therapies recently approved by the FDA. This site is designed for both for patients interested in participating in clinical trials and for research professionals.
Mayo Clinic Clinical Trials - http://clinicaltrials.mayo.edu
Dystonia Coalition Registry - http://www.globaldystoniaregistry.org