[1] Acad Hosp Schwabing, Metab Dis Ctr Munich Schwabing, Inst Clin Chem Mol Diagnost & Mitochondrial Genet, D-80804 Munich, Germany
[2] Univ Munich, Dept Neurol, Friedbrich Baur Inst, D-8000 Munich, Germany
[3] Max Planck Inst Mol Genet, Berlin, Germany
[4] Univ Munich, Inst Pathol, D-8000 Munich, Germany