Development and validation of a coronary risk prediction model for older U.S. and European persons in the Cardiovascular Health Study and the Rotterdam Study. by Koller, M, Leening, M, Wolbers, M, Steyerberg, E, Hunink, MG, Schoop, R, Hofman, A, Bucher, H, Psaty, B, Lloyd-Jones, D, Witteman, J