[1] Duke Univ, Sch Med, Dept Med, Div Cardiol, Durham, NC USA
[2] SUNY Stony Brook, Long Isl City, NY USA
[3] Wake Forest Sch Med, Sect Cardiovasc Med, Dept Internal Med, Winston Salem, NC USA
[4] SUNY Stony Brook, Dept Med, Div Cardiol, Sch Med, Stony Brook, NY 11794 USA
[5] Duke Univ, Dept Med, Div Cardiol, Sch Med, 2301 Erwin Rd, Durham, NC 27710 USA