1. From Department of Neurology (C.G.), Martin-Luther-University Halle-Wittenberg, Germany; Department of Neurology (W.D., F.J.E.), Nuremberg Municipal Hospital, Germany; Department of Cardiothoracic Surgery (I.F.), Martin-Luther-University Halle-Wittenberg, Germany; Department of Cardiothoracic Surgery (J.S.), Nuremberg Municipal Hospital, Germany.