1. Kings College London Department of Population Health Sciences, School of Life Course and Population Sciences, , London , UK
2. Guys and St Thomas’s NHS Foundation Trust Department of Physiotherapy, , London , UK
3. Kings College London Centre for Human and Applied Physiological Sciences (CHAPS), School of Basic and Medical Biosciences, , London , UK
4. University of Southampton Faculty of Environmental and Life Sciences, School of Health Sciences, , Southampton , UK
5. University of British Columbia School of Population and Public Health, , Vancouver, British Columbia , Canada
6. University of Nottingham Faculty of Medicine and Health Sciences, , Nottingham , UK