1. Newcastle Magnetic Resonance Centre, Institute of Cellular Medicine; Newcastle University, Campus for Ageing and Vitality; Newcastle upon Tyne NE4 5PL UK
2. Institute of Genetic Medicine; Newcastle University, International Centre for Life; Central Parkway, Newcastle upon Tyne UK
3. Wellcome Trust Centre for Mitochondrial Research; Institute for Ageing and Health, Newcastle University; Newcastle upon Tyne UK
4. Cardiothoracic Centre, Freeman Hospital; Newcastle upon Tyne NHS Foundation Trust; Newcastle upon Tyne UK