1. Department of Pediatrics, Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
2. Psychogenics, Inc., Hawthorne, New York.
3. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania.
4. Department of Neurosurgery, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania.
5. Division of Pediatric Critical Care Medicine, Penn State University College of Medicine, Penn State Children's Hospital, Hershey, Pennsylvania.
6. Department of Critical Care Medicine, Safar Center for Resuscitation Research and Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.