Further details are available in the following URLs:
- http://www.bmj.com/content/347/bmj.f6492
- http://www.bmj.com/node/758233
- http://www.bmj.com/node/759360
- http://www.bmj.com/node/755022
Database complies with the terms and conditions of ClinicalTrials.gov (available at:http://clinicaltrials.gov/ct2/about-site/terms-conditions) and the WHO ICTRP (available at: http://www.who.int/ictrp/search/download/en/) for using downloaded data.