1. Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA, USA
2. Neurocritical Care Unit, Harborview Medical Center, Seattle, WA, USA
3. Neurocritical Care Service, Harborview Medical Center, Seattle, WA, USA
4. Department of Neurological Surgery, University of Washington, Seattle, WA, USA
5. Department of Neurology, University of Washington, Seattle, WA, USA