[1] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Dept Anesthesiol, 1 Deaconess Rd,CC-454, Boston, MA 02215 USA
[2] Weill Cornell Med Coll, Dept Anesthesiol, New York, NY USA
[3] Univ Costa Rica, Hosp Mexico CCSS, Dept Anesthesiol, San Jose, Costa Rica
[4] Duke Univ, Med Ctr, Dept Anesthesiol, Durham, NC 27710 USA
[5] Montreal Heart Inst, Div Montreal Heart Inst, Dept Anesthesiol & Crit Care, Montreal, PQ H1T 1C8, Canada
[6] Emory Univ Hosp, Dept Anesthesiol, Atlanta, GA 30322 USA
[7] Temple Sch Med, Allegheny Hlth Network, Dept Anesthesiol, Philadelphia, PA USA
[8] Hosp Special Surg, Dept Anesthesiol, 535 E 70th St, New York, NY 10021 USA
[9] Univ Chicago Med, Dept Anesthesiol, Chicago, IL USA
[10] Univ Ghent, Univ Hosp Ghent, Dept Anesthesiol, B-9000 Ghent, Belgium
[11] Harvard Univ, Brigham & Womens Hosp, Dept Anesthesiol, Sch Med, Boston, MA 02215 USA
[12] Med Univ S Carolina, Dept Anesthesia & Perioperat Med, Charleston, SC 29425 USA