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, University of Pittsburgh, Pittsburgh, Pennsylvania.
4. Department of Gynecology and Obstetrics, Emory University, Atlanta, Georgia.
5. Department of Neurosurgery, University of Pittsburgh, Pittsburgh, Pennsylvania.
6. School of Nursing, University of Pittsburgh, Pittsburgh, Pennsylvania.
7. Department of Obstetrics and Gynecology, Wake forest University, Winston-Salem, North Carolina.