1 Liverpool Centre for Cardiovascular Science, University of Liverpool, Liverpool John Moores University, Liverpool Heart and Chest Hospital, Liverpool, UK; Department of Cardiology, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool L14 3PE, UK.
2 Liverpool Centre for Cardiovascular Science, University of Liverpool, Liverpool John Moores University, Liverpool Heart and Chest Hospital, Liverpool, UK; Department of Cardiology, Liverpool Heart and Chest Hospital NHS Foundation Trust, Liverpool L14 3PE, UK; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark. Electronic address: gregory.lip@liverpool.ac.uk.