[1] Duke Univ, Med Ctr, Duke Clin Res Inst, Durham, NC 27710 USA
[2] Univ Alberta, Edmonton, AB, Canada
[3] Royal Infirm Edinburgh NHS Trust, Edinburgh, Midlothian, Scotland
[4] Ctr Chron Dis Control, New Delhi, India
[5] Auckland City Hosp, Green Lane Cardiovasc Serv, Auckland, New Zealand