1. Department of Physical Medicine and Rehabilitation, Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, Pennsylvania
2. Department of Critical Care Medicine, Safar Center for Resuscitation Research, University of Pittsburgh, Pittsburgh, Pennsylvania
3. School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
4. Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, Pennsylvania