<qa>  What is a double blind randomized clinical trial?This is a double blind randomized clinical trial evaluating high volume simethicone 750 ml at 1.5 mgml versus standard volume simethicone 200 ml at 1.5 mgml for CE. Randomization will be performed in blocks of varying sizes through a web based interface, Research Electronic Data Capture REDCap, to ensure concealed allocation. Patients, physicians, and outcome assessors will be blinded to randomization allocation. 