[1] St Marys Hosp, Mayo Clin Fdn, Ctr Coronary Physiol & Imaging, Cardiovasc Div,Cardiac Lab, Rochester, MN 55902 USA
[2] Univ Med Ctr, Div Cardiovasc, Tucson, AZ USA
[3] Tel Aviv Med Ctr & Sch Med, Div Cardiovasc, Tel Aviv, Israel
[4] St Louis Univ, Div Cardiovasc, St Louis, MO 63103 USA
[5] Mayo Clin Fdn, Biostat Sect, Rochester, MN USA