Publication bias is a major obstacle to scientific progress. Without a full view of clinical trial results, both positive and negative, the scientific community ends up drawing incorrect conclusions. The National Institutes of Health (NIH) launched clinicaltrials.gov to address this issue by:
requiring trial preregistration
requiring trials to publicly report results
for studies involving FDA-regulated drugs and devices.
The Results
Unfortunately, universities and pharma companies frequently report results late or not at all. Let's see who is making a strong effort, and who needs to improve.