1. Department of Health and Community Sciences; University of Exeter Medical School, Faculty of Health and Life Sciences, St Luke’s Campus, University of Exeter; Exeter UK
2. Institute of Applied Health Research; University of Birmingham; Birmingham UK
3. Cardiac Rehabilitation; University Hospital Crosshouse, NHS Ayrshire and Arran; Kilmarnock UK
4. Flat 1/1,14 Willowbank Crescent; Glasgow UK
5. MRC/CSO Social and Public Health Sciences Unit & Robertson Centre for Biostatistics, Institute of Health and Well Being; University of Glasgow; Glasgow UK