Imperial College London, Charing Cross Hospital, London, United Kingdom
Royal Brompton Hospital, London, United Kingdom
John Radcliffe Hospital, Oxford, United Kingdom
St Bartholomew's Hospital, London, United Kingdom
Hammersmith Hospital, Imperial College Healthcare, London, United Kingdom
North West London Hospitals NHS Trust, London, United Kingdom
Imperial College NHS Trust, London, United Kingdom
Imperial College Healthcare NHS Trust, London, United Kingdom
National Heart and Lung Institute, London, England, United Kingdom
St Mary's Hospital, London, United Kingdom
St. Stephen's AIDS Trust, London, United Kingdom
St. Mary's Hospital, London, United Kingdom
Imperial College NHS Trust, London, United Kingdom