If you are interested in taking part in this trial or would like any more information, please contact your local trial team:

• Royal Brompton Hospital, London
• Aintree University Hospital, Liverpool
• Royal Papworth Hospital, Cambridge
• Princess Alexandra Hospital, Harlow
• Royal Derby Hospital, Derby
• Blackpool Victoria Hospital, Blackpool
• Ninewells Hospital & Medical School, Dundee
• Freeman Hospital, Newcastle