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2. Spinal analgesia;Atkinson,1993
3. A cross national perspective. The Merck Manual of Geriatrics,1996
4. Hypotension, subarachnoid block and the elderly patient;Critchley;Anaesthesia,1996
5. Hemodynamic response and change in organ blood volume during spinal anesthesia in elderly men with cardiac disease;Rooke;Anesth Analg,1997