3Leslie A, Steele RJ. Colonoscopy. J R Coll Surg Edinb, 2002,47 : 502 -509.
4Rex DK. Accessing proximal aspects of folds and flexures during colonoscopy: impact of a pediatric colonoscope with a short bending section. Am J Gastroenterol,2003,98 : 1504-1507.
5Yoo TW, Park DI, Kim YH, et al. Clinical significance of small colorectal adenoma less than 10 ram: the KASID study. Hepatogastroenterology, 2007,54 : 418 -421.
6Lee IL, Wu CS. Less patient discomfort by one-man colonoscopy examination, lnt J Clin Pract,2006 ,60 :635-638.
7Kozarek RA, Eumest DL, Silverstein ME, et al. Airpressure-induced colon injury during diagnostic colonoscopy. Gastroenteral, 1980,78:7-14.
5Burke EL,Chappelka AR,Levine SM.Examination of the esophago-gastric junction area and fundus by retroflexion of the flexible-tip gastroscope:an analysis of 100 consecu- tive attempts[J].Gastrointest Endosc,1970,16(3):130.
6Grobe JL5Kozarek RA,Sanowski RA.Colonoscopic retro- flexion in the evaluation of rectal disease[J].Am J Gas- troenterol,1982,77(11):856-858.
7Cutler AF,Pop A.Fifteen years later;colonoscopic retro- flexion revisited[J].Am J Gastroenterol,1999,94(6):1537-1538.
8Brandt LJ,Gotian A.Retroflexion in the duodenum for e- valuation of duodenal bulb lesions[J].Gastrointest En- dosc,2002,55(3):438-440.
9Onozato Y,Ishihara H,Iizuka H,et al.A large flat adeno- ma located on the pylorus ring successfully treated by en- doscopic submucosal dissection[J].Dig Dis Sci,2007,52(7):1738-1740.
10Lim CH,Park JM,Park CH,et al.Endoscopic submucosal dissection of gastric neoplasia involving the pyloric Chan- nel by retroflexion in the duodenum[J].Dig Dis Sci,2012,57(1):148-154.
