1Vofker F, Eckardt, Gerd Kanzfer. Complications and adverse effects of colonoscopy with selective sedation[J]. Gastrointest Endosc, 1999, 49(5): 560-565
2Rankin GB. Indications, contraindication, and complications of colonoscopy[ M ]//Suvak M. Gastrienterolgical endoscopy. Philadelphia: WB Saunders, 1987: 868-880
