1. Institute of Sport, Exercise and Health, Division of Surgery & Interventional Science, University College London , London , UK
2. MRC Unit for Lifelong Health and Ageing at UCL , London , UK
3. MRC Biostatistics Unit, University of Cambridge , Cambridge , UK
4. AGE Research Group, Translational and Clinical Research Institute, Faculty of Medical Sciences, Newcastle University , Newcastle upon Tyne , UK
5. NIHR Newcastle Biomedical Research Centre, Newcastle University and Newcastle Upon Tyne Hospitals NHS Foundation Trust , Newcastle upon Tyne , UK