1. Department of Pediatrics, University of Pittsburgh, Pittsburgh, Pennsylvania, U.S.A.
2. Department of Anesthesiology and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, U.S.A.
3. Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, U.S.A.
4. Department of Psychiatry, Safar Center for Resuscitation Research, and Brain Trauma Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania, U.S.A.