1. Department of Trauma Research, Swedish Medical Center, Englewood, CO 80113, USA
2. InterMountain Neurosurgery, St. Anthony Hospital, Lakewood, CO 80228, USA
3. Medical Center of Plano, Plano, TX 75075, USA
4. Department of Trauma Research, St. Anthony Hospital, Lakewood, CO 80228, USA
5. Department of Biomedical Sciences, Rocky Vista University, Aurora, CO 80134, USA
6. Penrose-St. Francis Health Services, Colorado Springs, CO 80907, USA