[1] Michigan State Univ, Dept Physiol, E Lansing, MI 48824 USA
[2] Evangelismos Gen Hosp, Div Cardiol 2, GR-11526 Athens, Greece
[3] Case Western Reserve Univ, Metrohlth Med Ctr, Div Cardiol, Cleveland, OH 44106 USA
[4] Univ Med Ctr, Dept Med, Stony Brook, NY 11794 USA
[5] Vet Affairs Med Ctr, Northport, NY 11772 USA