1. Wellcome Centre for Mitochondrial Research, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
2. Translational Stem Cell Biology & Metabolism Program, Research Programs Unit, Faculty of Medicine, University of Helsinki, Helsinki, Finland
3. Department of Anatomy, Faculty of Medicine, University of Helsinki, Helsinki, Finland
4. NHS Highly Specialised Service for Rare Mitochondrial Disorders of Adults and Children, Newcastle University, Newcastle upon Tyne, UK