1. Smoking and Carcinoma of the Lung
2. Pancreatic extracts in the treatment of diabetes mellitus;Banting FG;Can Med Assoc J,1922
3. Sources of evidence for assessing the safety efficacy and effectiveness of medicines. The Academy of Medical Sciences. Available at:https://acmedsci.ac.uk/policy/policy‐projects/methods‐of‐evaluating‐evidence. Accessed January 8 2019.
4. IMI GetReal ‐ Real‐Life Data in Drug Development > Home. Available at:http://www.imi‐getreal.eu/. Accessed January 8 2019.
5. Understanding randomised controlled trials