[1] Yale Univ, Sch Med, New Haven, CT USA
[2] Heart Ctr NRW, Bad Oeynhausen, Germany
[3] St Luc Hosp, Brussels, Belgium
[4] Niguarda CaGranda, Cardiothor Surg, Milan, Italy
[5] Grosshadern Hosp, Munich, Germany
[6] Mt Sinai Med Ctr, New York, NY 10029 USA
[7] Ottawa Heart Inst, Ottawa, ON, Canada
[8] McGuire VA Med Ctr, Richmond, VA USA