1. A controlled trial of prophylactic portacaval-shunt surgery;Garceau;N Engl J Med,1964
2. A control trial of colon bypass in chronic hepatic encephalopathy;Resnick;Gastroenterology,1968
3. Exclusion of the colon in the treatment of hepatic encephalopathy;McDermott;N Engl J Med,1962
4. Randomization of the first patient;Chalmers;Med Clin North Am,1975
5. Rentrop KP: Randomized clinical trial of non-surgical reperfusion in acute myocardial infarction. (Study in progress)