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    					| Comparative Study on the Effect of Spinal Anesthesia and Epidural Anesthesia on Short Term Cognitive Function and Stress Response in the Elderly Patients after Orthopedic Surgery | 
  					 
  					  										
						| WENG Hongliang, LI Yujian, CHEN Benfa, MA Yufeng, LI Xingda | 
					 
															
						| First-author's address: Department of Anesthesiology, Linyi Central Hospital, Yishui 276400, China | 
					 
										
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