1. From the Departments of Neurology (R.F., R.O., R.M., A.B., D.N., R. Parker, R. Peyravi, J.L.S., L.H.S., K.N.S., A.H., A.J., R.N., R.S.) and Emergency Medicine (C.W.), Yale School of Medicine, New Haven, CT; and Department of Biostatistics (J.W.), Yale School of Public Health, New Haven, CT.