1. NHS Greater Glasgow and Clyde , G12 0XH , UK
2. School of Medicine, Dentistry and Nursing, University of Glasgow , Glasgow G12 8QQ , UK
3. School of Cardiovascular and Metabolic Health, University of Glasgow , Glasgow G12 8TA , UK
4. School of Health and Wellbeing, University of Glasgow , Glasgow G12 8TB , UK
5. Sydney School of Public Health, University of Sydney , Sydney NSW 2050 , Australia
6. NHMRC Clinical Trials Centre, University of Sydney , Sydney NSW 2050 , Australia