In the United States a<unk>  provides emergency medicine to trauma patients. A<unk>  works in collaboration with a<unk> .  It provides comprehensive trauma care and supplements the clinical expertise of a Level I institution.  It provides 24-hour availability of all essential specialties, personnel and equipment.   Minimum volume requirements may depend on local conditions.  These institutions are not required to have an ongoing program of research or a surgical residency program. Hospitals are designated as a<unk>  by the American College of Surgeons for a period of three years.
Level II trauma center
Level III trauma center
Level I trauma center
Subdural empyema case study one
HAZMAT Class 1 Explosives
APEX Trial
Clinical event committee or event adjudication committee 
Index case