1. From the Departments of Anesthesia and Perioperative Care (M.K., H.F., T.M., M.K., F.S., A.K., T.H.)
2. Department of Neurosurgery and Neurobiology, Barrow Neurological Institute, Phoenix, AZ (T.M., T.H.).
3. Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University School of Medicine, CA (X.X., R.G.G.)
4. Neurological Surgery (C.R., T.H.), University of California, San Francisco