The WASh Trial: water-assisted sigmoidoscopy in the English Bowel Scope Screening Programme: study protocol for a randomized multicenter trial by Iosif Beintaris, Shiran Esmaily, Brian P. Saunders, Colin J. Rees, Christian Von Wagner, Zacharias Tsiamoulos, Zoe Hoare, Rachel Evans, Seow Tien Yeo, R. T. Edwards, Tony Larkin, Andrew Veitch, Andrew Chilton, Michael G. Bramble, Jill Deane, Matthew D. Rutter

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