via Cochrane Collaboration:

The +AllTrials initiative and the consequences of unreported trial data

The +AllTrials initiative (All Trials Registered | All Results Reported) was launched in January 2013 to draw attention to the issue of unreported trial data. Thousands of clinical trials have been conducted from which no or limited data have been made available; these data are critical to enable doctors and regulators to make informed decisions about treatment. This is a serious problem for evidence-based healthcare researchers, including The Cochrane Collaboration, because we need all the evidence about a treatment to understand its risks and benefits. Without a complete picture of trial results available, information is lost, bad treatment decisions may be made, opportunities for better and more effective treatment are missed, and trials are repeated unnecessarily, duplicating effort and wasting resources. read the rest here

via Cochrane Collaboration on youtube:

Cochrane Collaboration UK and Ireland

21st Anniversary Symposium

Ben Goldacre