1. Vascular Sciences Section, Imperial College, Hammersmith Hospital, London, United Kingdom.
2. Present address: Department of Cardiology, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taipei, Taiwan.
3. Airway Disease Section, National Heart and Lung Institute, Imperial College, Hammersmith Hospital, London, United Kingdom.
4. Vascular Surgery, Imperial College, Hammersmith Hospital, London, United Kingdom.
5. Present address: Department of Biochemistry, Sargodha Medical School, University of Sargodha, Pakistan.
6. Centre for Pharmacology & Therapeutics, Department of Medicine, Imperial College, Hammersmith Hospital, London, United Kingdom.