[1] Beth Israel Deaconess Med Ctr, Div Gen Med & Primary Care, Boston, MA 02215 USA
[2] Beth Israel Deaconess Med Ctr, Cardiovasc Epidemiol Res Unit, Boston, MA 02215 USA
[3] Harvard Univ, Sch Publ Hlth, Dept Biostat, Boston, MA 02115 USA
[4] Harvard Univ, Sch Med, Boston, MA USA
[5] Harvard Univ, Sch Publ Hlth, Dept Epidemiol, Boston, MA 02115 USA