1. Wellcome Trust Centre for Mitochondrial Research Institute for Ageing and Health, Newcastle University Newcastle upon Tyne UK
2. Nuffield Department of Obstetrics and Gynaecology University of Oxford Oxford UK
3. Department of Neurology The West Suffolk Hospital, Bury St Edmunds Suffolk UK
4. Department of Clinical Genetics, East Anglian Medical Genetics Service Addenbrooke's Hospital Cambridge UK
5. Department of Pathology University of Cambridge Cambridge UK
6. Department of Neurology Royal Victoria Infirmary Newcastle upon Tyne UK
7. Department of Clinical Neurosciences University of Cambridge Cambridge UK
8. Department of Neurology Addenbrooke's Hospital Cambridge UK
9. West Midlands Regional Clinical Genetics Unit Birmingham Women's NHS Foundation Trust Birmingham UK
10. The Walton Centre NHS Foundation Trust Liverpool UK
11. Wessex Neurological Centre University Hospitals Southampton Southampton UK