No Abstract Available. From the Graduate Department of Orthodontics, University of Toronto, Ontario. This study was made possible in part through the Medical Research Council of Canada Grant MA-3600, United States Department of Health, Education and Welfare Grant 5 RO1 DEO 28337-03 and by the use of the Burlington Research Centre material which was assisted by funds provided by the Evaluation of Interceptive Orthodontics Grant 605-7-299 of the National Health and Welfare Grants Programme.
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Pileski et al. (1973) studied this question.