Department of Neurosurgery, City of Hope National Medical Center, Duarte, Calif., and Division of Clinical Neurology, Pain Center, City of Hope National Medical Center, Duarte, Calif.U.S.A. Accepted May 10, 1976. ☆ Presented to the American Association of Neurological Surgeons, April 4–8, 1976, San Francisco, Calif. U.S.A.
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Felsööry et al. (1976) studied this question.