1. University of Oxford, Oxford, United Kingdom (S.S., C.B., A.C., A.G., S.M., L.Y.)
2. University Hospital Monklands, Airdrie, United Kingdom (G.E.)
3. Royal Devon and Exeter NHS Foundation Trust, Exeter, Devon, United Kingdom (A.H.)
4. Aneurin Bevan University Health Board, Newport, South Wales, United Kingdom (P.K.)
5. Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom (P.L., D.J.S.)
6. St John's Hospital, NHS Lothian, Howden, Livingston, United Kingdom (S.R.)
7. Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom (R.S.)
8. Victoria Hospital, Kirkcaldy, United Kingdom (A.W.)
9. University of Leeds, Leeds, United Kingdom (J.Y.)