The endoscopic procedure as such is not much different from a standard endoscopic procedure that patient should be advised to undergo according to good clinical practice. The bowel preparation is similar as in a normal colonoscopy, and can be performed either at home or in the endoscopy department. The endoscopes used in the study include the H180Q series of Olympus, the 5000 series of Fujinon and the HD series of Pentax. They are not different in terms of design or size compared to standard colonoscopies and are all commercially available.