[1] Johns Hopkins Univ Hosp, Dept Anesthesia & Crit Care Med, Baltimore, MD 21287 USA
[2] Univ Massachusetts, Sch Med, Div Trauma & Crit Care Med, Worcester, MA 01605 USA
[3] Univ Pittsburgh, Dept Crit Care Med, Pittsburgh, PA USA
[4] LDS Hosp, Dept Crit Care Med, Salt Lake City, UT USA
[5] Univ Calif San Francisco, Dept Crit Care Med, San Francisco, CA 94143 USA
[6] Univ Virginia, Hlth Syst, Dept Anesthesiol, Charlottesville, VA USA
[7] Orlando Reg Med Ctr Inc, Dept Emergency Med, Orlando, FL USA
[8] Childrens Hosp Philadelphia, Pediat Intens Care Unit, Philadelphia, PA 19104 USA
[9] Oregon Hlth & Sci Univ, Adult Crit Care Serv, Portland, OR 97201 USA
[10] Henry Ford Hosp, Div Trauma Surg, Detroit, MI 48202 USA
[11] Bridgeport Hosp, Dept Surg, Bridgeport, CT USA
[12] NIH, Ctr Clin, Dept Crit Care Med, Bethesda, MD 20892 USA
[13] Columbia Univ Coll Phys & Surg, Columbia Presbyterian Med Ctr, New York, NY 10032 USA
[14] Univ Maryland, Med Syst, Dept Surg, Baltimore, MD 21201 USA