[1] Ruhr Univ Bochum, Dept Neurol, Knappschaftskrankenhaus, D-44892 Bochum, Germany
[2] Univ Bonn, Dept Internal Med, D-53105 Bonn, Germany
[3] Univ Cologne, Dept Internal Med, D-50937 Cologne, Germany
[4] Univ Zurich, Dept Neurol, CH-8091 Zurich, Switzerland
[5] Univ Dresden, Dept Neurosurg, D-01397 Dresden, Germany
[6] Univ Dresden, Dept Neurol, D-01397 Dresden, Germany
[7] Univ Dresden, Dept Internal Med, D-01397 Dresden, Germany
[8] Univ Heidelberg, Dept Neurol, D-69120 Heidelberg, Germany
[9] Univ Kiel, Dept Internal Med, D-24116 Heidelberg, Germany
[10] Univ Bonn, Dept Pediat Hematooncol, D-53105 Bonn, Germany
[11] Univ Bonn, Dept Neurosurg, D-53105 Bonn, Germany