1 Department of Psychiatry, Stanford University School of Medicine, Palo Alto, California, Although the data were accumulated over a ten year period, most of the analysis was done with support of Research Grant MH-08185 from the National Institutes of Health, U.S.P.H.S. 2 Department of Psychology, Yeshiva University, Bronx, New York. 3 The Psychiatric Institute, 722 West 168th Street, New York City.
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Dement et al. (1965) studied this question.