1. Medical Research Council Mitochondrial Biology Unit, University of Cambridge, Cambridge, UK; Department of Clinical Neurosciences University of Cambridge Cambridge UK
2. Mitochondrial Medicine Frontier Program, Division of Human Genetics, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pediatrics University of Pennsylvania Perelman School of Medicine Philadelphia, PA USA
3. Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA; Howard Hughes Medical Institute and Departments of Molecular Biology and Medicine, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Systems Biology Harvard Medical School Boston, MA 02115 USA
4. Mitochondrial Research Group, UCL Great Ormond Street Institute of Child Health, London, UK; Metabolic Unit Great Ormond Street Hospital for Children NHS Foundation Trust London, UK