1 Department of Ageing and Health, Guy's and St Thomas' Hospital, London, United Kingdom.
2 Leicester School of Allied Health Sciences, De Montfort University, Leicester, United Kingdom.
3 The Evington Centre, Leicestershire Partnership National Health Service (NHS) Trust, Leicester, United Kingdom.
4 Department of Cardiovascular Sciences, University of Leicester, Leicester, United Kingdom.
5 National Institute for Health Research Leicester Biomedical Research Centre, British Heart Foundation Cardiovascular Research Centre, Glenfield Hospital, Leicester, United Kingdom.