Use of a variable-stiffness colonoscope decreases the dose of patient-controlled sedation during colonoscopy: a randomized comparison of 3 colonoscopes by Lee, Danny W.H., MD, Li, Anthony C.N., FRCS, Ko, Chi-wah, FRCS, Chu, David W., FRCS, Chan, Kang-chung, FRCS, Poon, Chi-ming, FRCS, Sin, Kwok-sang, FRCS, Leung, Kam-fung, FRCS, Sze, Tak-suen, FFARACS, Chan, Angus C.W., MD, Chung, Sydney C.S., MD

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