1. Department of Thoracic MedicineImperial College School of MedicineNational Heart and Lung Institute London SW3 6LY U.K
2. Pharmacology DepartmentRhone‐Poulenc RorerDagenham Research Centre R&D, Dagenham Essex RM10 7XS U.K.
3. Cardiothoracic SurgeryImperial College School of MedicineNational Heart and Lung Institute London SW3 6LY U.K
4. Unit of Critical Care MedicineImperial College School of MedicineRoyal Brompton Hospital London SW3 6NP U.K.