8Aitola P,Airo I,Kaukinen S,et al.Comparison of N2O and CO2 pneumoperitoneums during laparoscopic cholecystectomy with special reference to postoperative pain[J].Surg Laparosc Endosc,1998,8(2):140-144.
9Berberoglu M,Dilek ON,Ercan F,et al.The effect of CO2 insufflation rate on the postlaparoscopic shoulder pain[J].J Laparoendosc Adv Surg Tech A,1998,8(5):273-277.