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He who would make accurate forecasts as to those who will recover, and those who will die, and whether the disease will last a greater or less number of days, must understand all the symptoms thoroughly and be able to appreciate them, estimating their powers when they are compared with one another, as I have set forth. Hippocrates, Prognostic XXV (Jones, 1923-31)
Katz et al. (1962) studied this question.