[1] Duke Univ, Med Ctr, Duke Clin Res Inst, Div Cardiol,Dept Med, Durham, NC 27715 USA
[2] Univ Hosp Gathuisberg, Dept Cardiol, Louvain, Belgium
[3] Clin Trials Ctr, Natl Hlth & Med Res Council, Camperdown, NSW, Australia
[4] Auckland City Hosp, Green Lane Cardiovasc Serv, Auckland, New Zealand
[5] Univ Hosp, Uppsala Clin Res Ctr, Uppsala, Sweden
[6] Univ Alberta, Dept Med, Edmonton, AB, Canada