[1] Northwestern Univ, Div Cardiol, Feinberg Sch Med, Chicago, IL 60611 USA
[2] NHLBI, Bethesda, MD 20892 USA
[3] European Hosp, Rome, Italy
[4] Duke Univ, Med Ctr, Durham, NC USA
[5] Mt Sinai Hosp, Toronto, ON M5G 1X5, Canada
[6] Ohio State Univ, Columbus, OH 43210 USA
[7] Natl Inst Cardiol, Warsaw, Poland
[8] Med Univ Silesia, Katowice, Poland
[9] Montreal Heart Inst, Montreal, PQ H1T 1C8, Canada
[10] St Vincents Hosp, Melbourne, Vic, Australia