1. Department of Cardiothoracic Pharmacology, Imperial College London, National Heart and Lung Institute
2. The William Harvey Research Institute, Barts and The London School of Medicine & Dentistry, Queen Mary University of London, London, UK
3. Departments of Pharmacology and Medicine, Vanderbilt University, Nashville, TN, USA
4. The Ernest D Cooke Clinical Microvascular Unit, St Bartholomew’s Hospital, London, UK