2 Department of Neurology and Psychiatry, Northwestern University Medical School, Chicago, Illinois. 1 This investigation was supported by a grant from the Mental Health Fund of the Illinois Department of Public Welfare. The author is particularly indebted to Professors Benjamin Boshes, George Yacorzynski and K. A. Brownlee, and to Gertrud Schaffner, for their valuable assistance and advice.
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Harvey Nash (1962) studied this question.
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