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    					| Application Value of Bi-level Positive Airway Pressure Ventilation Combined with Pulmonary Rehabilitation in Chronic Obstructive Pulmonary Disease with Chronic Respiratory Failure | 
  					 
  					  										
						| XIAO Xianzhen | 
					 
															
						| First-author's address: Wuyishan Municipal Hospital, Fujian Province, Wuyishan 354300, China | 
					 
										
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