Ware, J H The futility index. An approach to the cost-effective termination of randomized clinical trials. [electronic resource] - The American journal of medicine Apr 1985 - 635-43 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0002-9343 Standard No.: 10.1016/0002-9343(85)90407-3 doi Subjects--Topical Terms: Clinical Trials as Topic--economicsCost-Benefit AnalysisHumansMathematicsRandom Allocation