Removal of infused water predominantly during insertion (water exchange) is consistently associated with a greater reduction of pain score - review of data in RCTs of water method colonoscopy Leung, F., Leung, J., Siao-Salera, R., Mann, S., Ramirez, F., Friedland, S., Amato, A., Radaelli, F., Hsieh, Y. WILEY-BLACKWELL. 2011: 128-129

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