Is blinding the endoscopists to bowel preparations in randomised controlled trials a reality?

Study hypothesis: The primary aim of this study was to explore whether endoscopists can be effectively blinded to the type of bowel preparation in the trials that compare the cleaning efficacy of oral sodium phosphate and polyethylene glycol
Primary outcome(s): The primary outcome of this study is to determine the proportion of correct estimation of the bowel preparation by all endoscopists combined