1. MRC-Mitochondrial Biology Unit, University of Cambridge, CB2 0XY, UK
2. Department of Clinical Neurosciences, University of Cambridge, Cambridge, CB2 0QQ, UK
3. Institute of Health and Society, Newcastle University, Baddiley-Clark Building, Richardson Road, Newcastle upon Tyne, NE2 4AX, UK
4. Universidad de Zaragoza-CIBER de Enfermedades Raras (CIBERER)-Instituto de Investigación Sanitaria de Aragón, Spain
5. Research Unit of Clinical Neuroscience, University of Oulu, Oulu, Finland and Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
6. Institute of Genetic Medicine, Newcastle University, UK