*Resident, Alfred I. duPont Institute, The Nemours Foundation, P. O. Box 269, Wilmington, Delaware 19899 **Associate Surgeon, Alfred I. duPont Institute, Wilmington, Delaware 19899 †Associate Surgeon-in-Chief, Alfred I. duPont Institute, Wilmington, Delaware 19899
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Rathgeb et al. (1974) studied this question.