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Level 5 evidence leaves open clinical relevance; prospective trials required before adoption.
*Clinical Fellow in Anesthesia.† David S. Sheridan Professor of Anaesthesia and Respiratory Therapy.‡ Assistant Clinical Professor of Medicine.Received from the Departments of Anaesthesia, Medicine and Surgery, Harvard Medical School, and Beth Israel Hospial, Boston, Massachusetts 02215.
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Eichhorn et al. (1976) studied this question.
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