Abstract
That we have learned much about controllable agencies contributory to the spread of disease by the group method has long been recognized. That reliance on the clinician’s experience of the response of individuals to a particular treatment may lead to unjustifiable conclusions, if without due regard to the principles of controlled experimentation, is also indisputable; and it has lately become a widely accepted dogma that a truly scientific evaluation of the efficacy of therapeutic or prophylactic measures is possible only by recourse to:
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