aClinical Professor and Director 1Division of Proctology, University of Minnesota, Minneapolis, Minnesota Read at the Meeting of the American Proctologic Society, Boston, Massachusetts, June 16 to 18, 1969. Supported in part by teaching and research funds from the Lewis and Annie Paper Foundation and the Division of Proctology, Department of Surgery, Medical Sciences, University of Minnesota.
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W. Bernstein (1970) studied this question.