1. From the Departments of Neurology (K.L., D.C.A.) and Medicine (A.J.C., C.A.H.), Hennepin County Medical Center, University of Minnesota, Minneapolis, Minn (K.L., D.C.A.); and the Chronic Disease Research Group, Minneapolis Medical Research Foundation, Minneapolis, Minn (C.A.S., A.J.C., C.A.H.).