1. Newcastle Magnetic Resonance Centre and Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom;
2. Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom;
3. Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom;
4. Department of Cardiology, Freeman Hospital, Newcastle upon Tyne, United Kingdom;
5. Mitochondrial Research Group, Institute for Ageing and Health, Newcastle University, Newcastle upon Tyne, United Kingdom; and
6. Institute for Ageing and Health, Newcastle University, Newcastle upon Tyne, United Kingdom