1. From the Neurological-Neurosurgical Intensive Care Unit and the Departments of Neurology (A.A.R., J.R.F., E.M.M., J.L.D.A., E.F.M.W.), Neurosurgery (J.A.F., J.L.D.A.), and Biostatistics (S.D.W., R.L.M.), Mayo Clinic College of Medicine, Rochester, Minn.