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- [4] The efficacy, acceptability and safety of the new 2L polyethylene glycol plus electrolytes plus ascorbic acid (PEG+E+ASC) vs the 4L polyethylene glycol 3350 plus electrolytes (PEG+E) in patients undergoing elective colonoscopies in a UK teaching hospital GASTROINTESTINAL ENDOSCOPY, 2008, 67 (05) : AB290 - AB291