A randomized single-blind trial of standard diet versus fiber-free diet with polyethylene glycol electrolyte solution for colonoscopy preparation - Soweid, A. M.; Kobeissy, A. A.; Jamali, F. R.; El-Tarchichi, M.; Skoury, A.; Abdul-Baki, H.; El-Zahabi, L.; El-Sayyed, A.; Barada, K. A.; Sharara, A. I.; Mourad, F.; Arabi, A. (Endoscopy, 2010)