1. Department of Surgery , College of Medicine, , 42nd and Emile Streets, Omaha, NE 68198 , United States
2. University of Nebraska Medical Center , College of Medicine, , 42nd and Emile Streets, Omaha, NE 68198 , United States
3. Department of Surgery , Division of Acute Care Surgery, , Omaha, NE 68198 , United States
4. University of Nebraska Medical Center , Division of Acute Care Surgery, , Omaha, NE 68198 , United States