[1] Cedars Sinai Med Ctr, Div Pulm & Crit Care, Los Angeles, CA 90048 USA
[2] McGill Univ, Div Cardiol, Montreal, PQ, Canada
[3] Duke Univ, Div Cardiol, Durham, NC USA
[4] Cedars Sinai Med Ctr, Div Cardiol, 8700 Beverly Blvd, Los Angeles, CA 90048 USA
[5] Univ N Carolina, Sch Med, Div Cardiol, Chapel Hill, NC USA
[6] Univ N Carolina, Sch Med, Div Pulm & Crit Care Med, Chapel Hill, NC USA
[7] Univ Alberta, Dept Crit Care, Edmonton, AB, Canada
[8] Univ Alberta, Div Cardiol, Edmonton, AB, Canada