Cadoni S, Sanna S, Gallittu P et al : A randomized, controlled trial comparing real-time insertion pain during colonoscopy confirmed water exchange to be superior to water immersion in enhancing patient comfort. Gastrointest Endosc 81 : 557- 566,2015
Liang S, Pan Y, Wang B et al : Complete small-bowel examination by oral single-balloon enteroscopy using the water-exchange method. Endoscopy 45 (Suppl 2 UCTN) : E415-E417,2013