| 1. | Huber DF, Martin EW Jr, Cooperman M. Cholecystectomy in elderly patients [J].Am J Surg, 1983; 146(6)∶ 719. | 
				                                                        
				                                                            
				                                                                | 2. | Harness JK, Strodel WE, Talsma SE. Symptomatic biliary tract disease in the elderly patient [J].Ann Surg, 1986; 52(8)∶ 442. | 
				                                                        
				                                                            
				                                                                | 3. | Van Steenbergen W, Rigauts H, Ponette E, et al. Percutaneous transhepatic cholecystostomy for acute complicated calculous cholecystitis in elderly patients [J]. J Am Geriatr Soc, 1993; 41(2)∶ 157. | 
				                                                        
				                                                            
				                                                                | 4. | Boland GW, Lee MJ, Mueller PR, et al. Gallstones in critically ill patients with acute calculous cholecystisis treated by percutaneous cholecystostomy: nonsurgical therapeutic options [J]. AJR Am J Roentgenol, 1994; 162(5)∶ 1101. | 
				                                                        
				                                                            
				                                                                | 5. | Shirai Y, Tsukada K, Kawaguchi H, et al. Percutaneous transhepatic cholecyststomy for acute acalculous cholecystitis [J]. Br J Surg, 1993; 80(11)∶ 1440. |