1. Safar Center for Resuscitation Research, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
2. Department of Anesthesiology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
3. Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
4. Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
5. Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
6. Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
7. Department of Epidemiology, Graduate School of Public Health University of Pittsburgh, Pittsburgh, Pennsylvania.
8. Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.