[1] Univ Calif Los Angeles, David Geffen Sch Med, Dept Anesthesiol, Los Angeles, CA 90095 USA
[2] Texas A&M Univ Syst HSC Coll Med, Sect Reprod Endocrinol & Infertil, Dept Obstet & Gynecol, College Stn, TX USA
[3] Barnes Jewish Coll Nursing, Dept Anesthesiol, St Louis, MO USA
[4] Washington Univ, St Louis, MO USA
[5] Uniformed Serv Univ Hlth Sci, Dept Surg, Div Trauma & Combat Surg, Bethesda, MD 20814 USA
[6] Amer Coll Chest Phys, Northbrook, IL USA
[7] Northwestern Univ, Feinberg Sch Med, Off Med Educ, Chicago, IL 60611 USA
[8] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Ctr Med Simulat,Dept Anesthesia & Crit Care, Boston, MA USA