1. Department of Critical Care Medicine, Pittsburgh, Pennsylvania.
2. Safar Center for Resuscitation Research, Pittsburgh, Pennsylvania.
3. Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania.
4. University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
5. Department of Environmental and Occupational Health, Pittsburgh, Pennsylvania.
6. Center for Free Radical and Antioxidant Health, Pittsburgh, Pennsylvania.
7. Department of Pediatrics, Pittsburgh, Pennsylvania.