Koller MT, Leening MJG, Wolbers M, Steyerberg EW, Hunink MGMyriam, Schoop R, Hofman A, Bucher HC, Psaty BM, Lloyd-Jones DM, et al. 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. Ann Intern Med. 2012 ;157(6):389-97.