Vijver, M.J. van de

colonoscopy colonography ct colonography screening participant cancer colorectal study colorectal cancer participation invite participation rate colorectal cancer screening lesion trial adenomas netherland group number individual 10 mm 100 invitees detection ct colonography screening centre preparation population colorectal cancers complication bowel table result dysplasia colonoscopy group participation rates procedure dutch fference detection rate adenoma value sigmoidoscopy ct colonography participants non-cathartic ct colonography erasmus university randomised status department amsterdam surveillance non-cathartic preparation di fference invitation article event january /oncology non-cathartic www.thelancet.com analysis 6–9 population-based randomisation 1276 colonoscopy participants sensitivity 6–9 mm lesions ct colonography group mortality technique signi carcinoma 50–75 years bowel preparation 100 participants sigmoidoscopy screening screening technique 2 weeks ffered radiology gastroenterol