1. What makes clinical research ethical?;Emanuel;JAMA,2000
2. Fundamentals of clinical trials;Friedman,2015
3. Equipoise and the ethics of clinical research;Freedman;N Engl J Med,1987
4. Generation of allocation sequences in randomised trials: chance, not choice;Schulz;Lancet,2002
5. A study of the effects of hypoglycemic agents on vascular complications in patients with adult-onset diabetes, I: design, methods and baseline results;Klimt;Diabetes,1970