1. Department of Cardiology, Poole Hospital NHS Foundation Trust, Poole, Dorset, United Kingdom and Bournemouth University, United Kingdom.
2. RAF Centre of Aviation Medicine, RAF Henlow, Beds, United Kingdom.
3. James Cook University Hospital, Middlesborough, United Kingdom.
4. Department of Medicine, Royal Victoria Infirmary and Northumbria NHS Foundation Trust, Newcastle upon Tyne, United Kingdom.
5. University of Newcastle, Newcastle upon Tyne, United Kingdom.