[1] Duke Univ, Med Ctr, Dept Internal Med, Div Cardiol, Durham, NC 27710 USA
[2] Duke Clin Res Inst, 300 W Morgan St, Durham, NC 27701 USA
[3] Univ Glasgow, Sch Cardiovasc & Metab Hlth, Glasgow, Scotland
[4] Baim Inst Clin Res, Boston, MA USA
[5] Massachusetts Gen Hosp, Harvard Med Sch, Cardiol Div, Boston, MA USA
[6] Natl Heart Ctr Singapore, Singapore, Singapore
[7] Duke Natl Univ Singapore, Singapore, Singapore
[8] Univ Texas SouthWestern Med Ctr Dallas, Dept Internal Med, Div Cardiol, Dallas, TX USA
[9] Res Inst St Joes, Hamilton, ON, Canada
[10] McMaster Univ, Hamilton, ON, Canada
[11] Parkland Hlth & Hosp Syst, Dallas, TX USA