1. From the Division of Vascular Neurology and Neurocritical Care, Department of Neurology, Baylor College of Medicine, Houston, TX (R.H.D., S.A.)
2. University of Texas Health Science Center at Houston School of Public Health (P.A.)
3. Southeast Texas Regional Advisory Council, Houston (C.B.)
4. Department of Neurology, McGovern School of Medicine, Houston, TX (S.S.)
5. Division of Neurosciences Critical Care, Department of Anesthesiology and Critical Care Medicine (J.I.S.)
6. Department of Neurology (J.I.S.)
7. Department of Neurosurgery (J.I.S.), Johns Hopkins University School of Medicine, Baltimore, MD.