1. What are clinical trials? National Heart, Lung, and Blood Institute https://www.nhlbi.nih.gov/studies/clinicaltrials (2012).
2. Notice of revised NIH definition of “clinical trial” (NIH, 23 October 2014); https://grants.nih.gov/grants/guide/notice-files/NOT-OD-15-015.html
3. NIH definition of clinical trial case studies. National Institutes of Health https://grants.nih.gov/policy/clinical-trials/case-studies.htm (2017).
4. Clinical trials. National Institute of Diabetes and Digestive and Kidney Diseases https://www.niddk.nih.gov/health-information/clinical-trials (2013).
5. Wolfe, J. et al. Open letter to NIH director Francis Collins (iPetitions, 2017); http://ipetitions.com/petition/open-letter-nih-collins