Please refer to this study by its ClinicalTrials.gov identifier: NCT00076648
| UC San Diego Medical Center |
| San Diego, California, United States, 92103 |
| Scripps Mercy |
| San Diego, California, United States, 92103 |
| Denver Health Medical Center |
| Denver, Colorado, United States, 80204 |
| Christiana Hospital |
| Newark, Delaware, United States, 19718 |
| Medical Center of Central Georgia |
| Macon, Georgia, United States, 31201 |
| Loyola University Medical Center |
| Maywood, Illinois, United States, 60153 |
| Wishard Memorial Hospital |
| Indianapolis, Indiana, United States, 46202 |
| Methodist Hospital of Indiana |
| Indianapolis, Indiana, United States, 46202 |
| University of Kansas Medical Center |
| Kansas City, Kansas, United States, 66160 |
| University of Kentucky Medical Center |
| Lexington, Kentucky, United States, 40536 |
| Detroit Receiving Hospital |
| Detroit, Michigan, United States, 48201 |
| Sinai Grace Hospital |
| Detroit, Michigan, United States, 48201 |
| The Mayo Clinic |
| Rochester, Minnesota, United States, 55905 |
| Albany Medical Center |
| Albany, New York, United States, 12208 |
| Duke University Medical Center |
| Durham, North Carolina, United States, 27710 |
| MetroHealth Medical Center |
| Cleveland, Ohio, United States, 44109 |
| University of Cincinnati Medical Center |
| Cincinnati, Ohio, United States, 45267-0769 |
| Miami Valley Hospital |
| Dayton, Ohio, United States, 45409 |
| Lehigh Valley Hospital |
| Allentown, Pennsylvania, United States, 18103 |
| St. Luke's Regional Resource Trauma Center |
| Bethlehem, Pennsylvania, United States, 18015 |
| Penn State Milton S. Hershey Medical Center |
| Hershey, Pennsylvania, United States, 17033 |
| University of Tennessee-Memphis |
| Memphis, Tennessee, United States, 38163 |
| Johnson City Medical Center |
| Johnson City, Tennessee, United States, 37604 |
| Memorial-Hermann Hospital |
| Houston, Texas, United States, 77030 |
| University of Texas Health Science Center |
| San Antonio, Texas, United States, 78284 |
| Brooke Army Medical Center |
| Fort Sam, Houston, Texas, United States, 78234-6315 |
| University of Utah Health Sciences Center |
| Salt Lake City, Utah, United States, 84132 |
| LDS Hospital |
| Salt Lake City, Utah, United States, 84143 |
| Sentara Norfolk Hospital |
| Norfolk, Virginia, United States, 23507 |
| Virginia Commonwealth University Medical Center |
| Richmond, Virginia, United States, 23298-0454 |
| Inova Fairfax Hospital |
| Falls Church, Virginia, United States, 22066 |
| West Virginia University/Jon Michael Moore Trauma Center |
| Morgantown, West Virginia, United States, 26506 |