National Institute for Health and Care Excellence – Guidance
NICE Guidance is an initiative from NICE UK.
WHO International Clinical Trials Registry
This is a platform to ensure that a complete view of research is accessible to all those involved in health care decision making. This will improve research transparency and will ultimately strengthen the validity and value of the scientific evidence base.
ClinicalTrials.gov
This is an initiative of the U.S. National Institutes of Health and is a registry and results database of publicly and privately supported clinical studies of human participants conducted around the world.