[1] MASSACHUSETTS GEN HOSP, CARDIAC CATHETERIZATION UNIT, BOSTON, MA 02114 USA
[2] MASSACHUSETTS GEN HOSP, ANESTHESIA LAB, BOSTON, MA 02114 USA
[3] MASSACHUSETTS GEN HOSP, CARDIOVASC SURG UNIT, BOSTON, MA 02114 USA
[4] HARVARD UNIV, MED SCH, DEPT ANESTHESIA, BOSTON, MA 02114 USA
[5] HARVARD UNIV, MED SCH, DEPT MED, BOSTON, MA 02114 USA
[6] HARVARD UNIV, MED SCH, DEPT SURG, BOSTON, MA 02114 USA