[1] Mayo Clin & Mayo Fdn, Coll Med, Dept Internal Med, Div Cardiovasc Dis, Rochester, MN 55905 USA
[2] Mayo Clin & Mayo Fdn, Coll Med, Dept Anesthesiol, Rochester, MN 55905 USA
[3] Mayo Clin & Mayo Fdn, Coll Med, City Rochester Early Defibrillat Program, Rochester, MN 55905 USA
[4] Mayo Clin & Mayo Fdn, Coll Med, Dept Emergency Med, Rochester, MN 55905 USA