1. Royal Free London NHS Foundation Trust, London, United Kingdom
2. Wirral University Teaching Hospital NHS Foundation Trust, Wirral, United Kingdom
3. Imperial College Healthcare NHS Trust, London, United Kingdom
4. Guy’s and St Thomas’ NHS Foundation Trust, London, United Kingdom
5. Oxford University Hospitals NHS Foundation Trust, Oxford, United Kingdom
6. Harley Clinic Group, 10 Harley Street, London, United Kingdom