[1] Vanderbilt Univ, Dept Surg, Med Ctr, Nashville, TN 37240 USA
[2] George Washington Univ, Dept Trauma Surg, Washington, DC USA
[3] Vanderbilt Univ, Med Ctr, Div Trauma & Surg Crit Care, Nashville, TN USA
[4] Univ Utah, Dept Gen Trauma Acute Care Surg & Surg Crit Care, Salt Lake City, UT USA