1 Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom.
2 Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom; PET Research Centre, Faculty of Health Sciences, University of Hull, Hull, United Kingdom.
3 Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom. Electronic address: L.D.Roberts@leeds.ac.uk.