THE EFFECTS OF TWENTY DEGREE HEAD-UP TILT UPON THE CEREBRAL CIRCULATION OF PATIENTS WITH ARTERIAL HYPERTENSION BEFORE AND AFTER SYMPATHECTOMY 1 by Hafkenschiel, Joseph H., Crumpton, Charles W., Shenkin, Henry A., Moyer, John H., Zintel, Harold A., Wendel, Herbert, Jeffers, William A., Harned, Sally Conlin, Keffer, Nelly J., Croft, Geraldine

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