Leigh DiseaseCytochrome-c Oxidase DeficiencyEncephalomalaciaBrain Diseases, MetabolicElectron Transport Complex IMitochondrial EncephalomyopathiesMitochondrial DiseasesMitochondrial ProteinsNADH DehydrogenaseMitochondrial Proton-Translocating ATPasesDNA, MitochondrialElectron Transport Complex IVAcidosis, LacticMELAS SyndromeMutationPyruvate Dehydrogenase (Lipoamide)Syndrome