1. McGovern Medical SchoolUniversity of Texas Health Science Center at Houston Houston Texas USA
2. Department of BiostatisticsSchool of Public HealthThe University of Texas Health Science Center at Houston Houston Texas USA
3. ESO Inc. Austin Texas USA
4. Williamson County Emergency Medical Services Georgetown Texas USA
5. Center for Injury ScienceUniversity of Alabama at Birmingham Birmingham Alabama USA
6. Department of Emergency MedicineThe University of Texas Health Science Center at Houston Houston Texas USA