Effect of a low-intensity PSA-based screening intervention on prostate cancer mortality: The CAP randomized clinical trial by Martin, RM, Donovan, JL, Turner, EL, Metcalfe, C, Young, GJ, Walsh, EI, Lane, JA, Noble, S, Oliver, SE, Evans, S, Sterne, JAC, Holding, P, Ben-Shlomo, Y, Brindle, P, Williams, NJ, Hill, EM, Ng, SY, Toole, J, Tazewell, MK, Hughes, LJ, Davies, CF, Thorn, JC, Down, E, Davey Smith, G, Neal, DE, Hamdy, FC, CAP Trial Group