Effect of 3-5 years of scheduled CEA and CT follow-up to detect recurrence of colorectal cancer: FACS randomized controlled trial. by Mant, D, Perera, R, Gray, A, Rose, P, Fuller, A, Corkhill, A, George, S, Little, L, Regan, S, Mellor, J, Pugh, SA, Northover, J, Weaver, A, Barsoum, G, Tan, LT, Mortensen, N, Scholefield, J, Wasan, H, Ferry, D, Primrose, J