[1] Univ Cologne, Fac Med, Dept Neurol, Cologne, Germany
[2] Univ Cologne, Univ Hosp Cologne, Cologne, Germany
[3] Univ Cologne, Fac Med, Dept Neuropathol, Cologne, Germany
[4] Univ Cologne, Fac Med, Dept Hepato & Gastroenterol, Cologne, Germany
[5] Forschungszentrum Julich, Inst Neurosci & Med INM 3, Leo Brandt Str 5, DE-52425 Julich, Germany
[6] Univ Aachen, Ctr Integrated Oncol CIO, Aachen, Germany
[7] Univ Bonn, Bonn, Germany
[8] Univ Cologne, Cologne, Germany
[9] Univ Duesseldorf, Dusseldorf, Germany