[1] Univ Calif Sacramento, Sacramento, CA USA
[2] Johns Hopkins Bloomberg Sch Publ Hlth, Baltimore, MD USA
[3] Univ Maryland, Sch Med, Baltimore, MD USA
[4] Univ Michigan, Ann Arbor, MI USA
[5] Brooke Army Med Ctr Ft Sam, Ft Sam Houston, TX USA
[6] Atrium Hlth, Charlotte, NC USA
[7] Univ Miami, Ryder Trauma Ctr, Miami, FL USA
[8] Univ Southern Calif, Keck Sch Med, Los Angeles, CA USA
[9] Harvard Med Sch, Brigham & Womens Hosp, Boston, MA USA
[10] Harvard Med Sch, Massachusetts Gen Hosp, Boston, MA USA
[11] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[12] Indiana Univ, Hlth Methodist Hosp, Indianapolis, IN USA
[13] Allegheny Gen Hosp, Pittsburgh, PA USA
[14] Landstuhl Reg Med Ctr, Landstuhl, Germany
[15] Univ Washington Med, Harborview Med Ctr, Seattle, WA USA
[16] Nemours Childrens Hlth, Orlando, FL USA
[17] Alaska Native Med Ctr, Anchorage, AK USA
[18] Univ Texas Hlth Sci Ctr Houston, McGovern Med Sch, Houston, TX USA