1. I. D. Conacher, MD, FFARCS, FRCPE, Consultant, Consultant Respiratory Physician, Regional Cardiothoracic Centre, Freeman Hospital, Newcastle upon Tyne NE7 7DN.
2. J. Dark, FRCS, Senior Lecturer in Cardiothoracic Surgery, Consultant Respiratory Physician, Regional Cardiothoracic Centre, Freeman Hospital, Newcastle upon Tyne NE7 7DN.
3. C. J. Hilton, FRCS, Consultant Cardiothoracic Surgeon, Consultant Respiratory Physician, Regional Cardiothoracic Centre, Freeman Hospital, Newcastle upon Tyne NE7 7DN.
4. P. Corris, MRCP, Consultant Respiratory Physician, Regional Cardiothoracic Centre, Freeman Hospital, Newcastle upon Tyne NE7 7DN.