1. Keele Cardiovascular Research Group, Institute for Applied Clinical Science and Centre for Prognosis Research; Institute of Primary Care and Health Sciences, University of Keele; Stoke-on-Trent UK
2. Academic Department of Cardiology, Royal Stoke Hospital; University Hospital North Midlands; Stoke-on-Trent UK
3. Farr Institute; University of Manchester; Manchester UK
4. Department of Pharmacy and Pharmacology; University of Bath; Bath UK
5. Research Applications and Data Management Team, IT Services; University of Aberdeen; Aberdeen UK
6. Academic Unit of Primary Medical Care, Northern General Hospital; Sheffield UK
7. Institute of Science and Technology in Medicine; University of Keele; Stoke-on-Trent UK
8. Institute of Applied Health Sciences; University of Aberdeen; Aberdeen UK
9. Norwich Research Park Cardiovascular Research Group, Norwich Medical School; University of East Anglia; Norwich UK