| 1. | Epstein SK,Nevins ML,Chung J.Effect of unplanned extubation on outcome of mechanical ventilation.Am J Respir Crit Care Med,2000,161:1912-1916. | 
				                                                        
				                                                            
				                                                                | 2. | Esteban A,Anzueto A,Frutos F,et al.Mechanical ventilation international study group.Characteristics and outcomes in adult patients receiving mechanical ventilation:a 28-day international study.JAMA,2002,287:345-355.. | 
				                                                        
				                                                            
				                                                                | 3. | Cooper LM,Linde-Zwirble WT.Medicare intensive care unit use:analysis of incidence,cost,and payment.Crit Care Med,2004,32:2247-2253. | 
				                                                        
				                                                            
				                                                                | 4. | Wagner DP.Economics of prolonged mechanical ventilation.Am Rev Respir Dis,1989,140:S14-S18. | 
				                                                        
				                                                            
				                                                                | 5. | MacIntyre NR,Cook DJ,Ely EW Jr,et al.Evidence-based guidelines for weaning and discontinuing ventilatory support:a collective task force facilitated by the American College of Chest Physicians;the American Association for Respiratory Care;and the American College of Critical Care Medicine.Chest,2001,120(6 Suppl):375S-395S. | 
				                                                        
				                                                            
				                                                                | 6. | Boles JM,Bion J,Connors A,et al.Weaning from mechanical ventilation.Eur Respir J,2007,29:1033-1056. | 
				                                                        
				                                                            
				                                                                | 7. | Saura P,Blanch L,Mestre J,et al.Clinical consequences of the implementation of a weaning protocol.Intensive Care Med,1996,22:1052-1056. | 
				                                                        
				                                                            
				                                                                | 8. | Krishnan JA,Moore D,Robeson C,et al.A prospective,controlled trial of a protocol-based strategy to discontinue mechanical ventilation.Am J Respir Crit Care Med,2004,169:673-678. | 
				                                                        
				                                                            
				                                                                | 9. | Burns KE,Adhikari NK,Meade MO.A meta-analysis of noninvasive weaning to facilitate liberation from mechanical ventilation.Can J Anesth,2006,53:305-315. | 
				                                                        
				                                                            
				                                                                | 10. | Peter JV,Moran JL,Phillips-Hughes J,et al.Noninvasive ventilation in acute respiratory failure--a meta-analysis update.Crit Care Med,2002,30:555-562. | 
				                                                        
				                                                            
				                                                                | 11. | Tobin MJ,Jubran A.Meta-analysis under the spotlight:focused on a meta-analysis of ventilator weaning.Crit Care Med,2008,36:1-7. |