1. University of Pittsburgh, School of Medicine, Pittsburgh, Pennsylvania.
2. Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, Pennsylvania.
3. Safar Center for Resuscitation Research, Universitry of Pittsburgh, Pittsburgh, Pennsylvania.
4. Department of Neurosurgery, University of Pittsburgh, Pittsburgh, Pennsylvania.
5. Department of Obstetrics/Gynecology, Wake Forest University, Winston-Salem, North Carolina.