1. From the Department of Neurology (D.S., C.W.), University Medical Center Freiburg, Freiburg, Germany; the Departments of Nuclear Medicine (R.B.) and Neurology (R.K.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany; and the Department of Neurology (J.R.), Klinikum Minden, Academic Teaching Hospital, Hannover Medical School, Minden, Germany.