1 Department of Neurology (J.R., C.K.), Department of Epileptology (W.S.K.), Life and Brain Centre (W.S.K.), and Centre for Rare Diseases Bonn (ZSEB) (C.K.), University Hospital of Bonn, Germany; Department of Neurology (D.L.), University of Halle/S., Germany; and Wellcome Trust Centre for Mitochondrial Research (D.L., S.A.H., G.F., C.V.Y.K., R.L.J., R.W.T.), Institute of Neuroscience, The Medical School, Newcastle University, Newcastle upon Tyne, UK.