1. Department of Emergency Medicine, University of Michigan, Ann Arbor, MI 48109; Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109
2. Department of Emergency Medicine, University of Michigan, Ann Arbor, MI 48109
3. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109
4. Department of Emergency Medicine, University of Michigan, Ann Arbor, MI 48109; Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109
5. Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI 48109; Department of Emergency Medicine, University of Michigan, Ann Arbor, MI 48109