1. Wellcome Trust Centre for Mitochondrial Research, Institute for Ageing and Health, The Medical School, Newcastle University, Newcastle upon Tyne, England
2. Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, England
3. Division of Neuropediatrics and Muscle Disorders, University Medical Center Freiburg, Freiburg, Germany
4. Department of Neuropediatrics, University of Essen, Essen, Germany
5. Department of Pediatrics, Hacettepe University, Ankara, Turkey
6. Department of Paediatrics, University Hospital Center Zagreb, School of Medicine, University of Zagreb, Zagreb, Croatia
7. Medical Genetics Center, Munich, Germany
8. Willink Biochemical Genetics Unit, Manchester Centre for Genomic Medicine, Central Manchester University Hospitals NHS Foundation Trust, Manchester, England
9. Department of Paediatric Neurology, Central Manchester University Hospitals NHS Foundation Trust, Manchester, England
10. Department of Paediatric Neurology, Newcastle upon Tyne Hospitals NHS Trust, Newcastle upon Tyne, England
11. Wellcome Trust Centre for Mitochondrial Research, Institute for Ageing and Health, The Medical School, Newcastle University, Newcastle upon Tyne, England10Department of Paediatric Neurology, Newcastle upon Tyne Hospitals NHS Trust, Newcastle upon Tyne, En