1. Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom
2. Wellcome Trust Centre for Mitochondrial Research, Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
3. Newcastle Fertility Centre, Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, United Kingdom
4. Hempsons, Hempsons House, Villiers Street, London, United Kingdom