1. Safar Center for Resuscitation Research, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
2. Department of Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
3. Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
4. Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania.
5. Department of Epidemiology and Public Health, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
6. Department of Pharmacology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
7. Department of Neurological Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.