Time requirements and health effects of participation in colorectal cancer screening with colonoscopy or computed tomography colonography in a randomized controlled trial

L. Van Dam^*, T. R. De Wijkerslooth, M. C. De Haan, E. M. Stoop, P. M.M. Bossuyt, P. Fockens, M. Thomeer, E. J. Kuipers, M. E. Van Leerdam, M. Van Ballegooijen, J. Stoker, E. Dekker, E. W. Steyerberg