To the Editor: The Special Article by Cassileth et al. (Aug. 23 issue)1 deals with a fascinating topic. The authors hypothesize that the psychological status of chronically ill patients does not differ according to the diagnosis. They proceed to verify this hypothesis by observing a fundamental similarity in the levels of depression, anxiety, and other indexes of psychological well-being and distress among populations of patients with various chronic illnesses. The best way to test hypotheses is to look at their horizon of expectations, a good example of which is given by Jacques Monod.2 In order for Darwin's theory of evolution.
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