[1] Univ Klinikum Mannheim, Dept Neurol, D-68135 Mannheim, Germany
[2] Heidelberg Univ, D-6800 Mannheim, Germany
[3] Heidelberg Univ, Dept Neurosurg, Univ Klinikum Mannheim, D-68135 Mannheim, Germany
[4] Acad Hosp Munich Schwabing, Inst Clin Chem Mol Diagnost & Mitochondrial Genet, Munich, Germany