發送短信 : Effects of preemptive analgesia in laparoscopic cholecystectomy: A double-blind randomized controlled trial

 _    _     ______    _  __    _____    _____    
| || | ||  /_   _//  | |/ //  |  ___|| |  __ \\  
| || | ||   -| ||-   | ' //   | ||__   | |  \ || 
| \\_/ ||   _| ||_   | . \\   | ||__   | |__/ || 
 \____//   /_____//  |_|\_\\  |_____|| |_____//  
  `---`    `-----`   `-` --`  `-----`   -----`