[1] Johns Hopkins Sch Med, Dept Anesthesiol & Crit Care Med, Baltimore, MD USA
[2] Johns Hopkins Sch Med, Dept Phys Med & Rehabil, Baltimore, MD USA
[3] Uniformed Serv Univ Hlth Sci, Bethesda, MD 20814 USA
[4] Johns Hopkins Sch Med, Dept Neurol, Baltimore, MD USA
[5] Texas Tech Sch Med, Dept Hlth Org Management, Lubbock, TX USA
[6] Walter Reed Natl Mil Med Ctr, Dept Neurol, Bethesda, MD USA
[7] Walter Reed Natl Mil Med Ctr, Dept Surg, Bethesda, MD USA
[8] Walter Reed Natl Mil Med Ctr, Dept Nursing, Bethesda, MD USA
[9] Drexel Univ, Dept Anesthesiol, Philadelphia, PA 19104 USA
[10] Womack Army Med Ctr, Ft Bragg, NC USA
[11] Naval Med Ctr San Diego, Dept Neurol, San Diego, CA USA
[12] Walter Reed Natl Mil Med Ctr, Dept Phys Med & Rehabil, Bethesda, MD USA
[13] Walter Reed Natl Mil Med Ctr, Dept Anesthesiol, Bethesda, MD USA
[14] Boston VA Hosp, Dept Anesthesiol, Boston, MA USA
[15] Naval Med Ctr San Diego, Dept Anesthesiol, San Diego, CA USA
[16] Landstuhl Reg Med Ctr, Dept Surg, Landstuhl, Germany
[17] Tripler Army Med Ctr, Dept Surg, Honolulu, HI 96859 USA
[18] Uniformed Serv Univ Hlth Sci, Dept Phys Med & Rehabil, Bethesda, MD 20814 USA
[19] DC VA Hosp, Dept Internal Med, Washington, DC USA
[20] DC VA Hosp, Dept Neurol, Washington, DC USA