1 West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK; British Heart Foundation Glasgow Cardiovascular Research Centre, Institute of Cardiovascular and Medical Sciences, University of Glasgow, Scotland, UK; University of New South Wales, Sydney, NSW, Australia.
2 West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK; British Heart Foundation Glasgow Cardiovascular Research Centre, Institute of Cardiovascular and Medical Sciences, University of Glasgow, Scotland, UK.
3 West of Scotland Heart and Lung Centre, Golden Jubilee National Hospital, Glasgow, Scotland, UK; British Heart Foundation Glasgow Cardiovascular Research Centre, Institute of Cardiovascular and Medical Sciences, University of Glasgow, Scotland, UK. Electronic address: colin.berry@glasgow.ac.uk.