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A. G. Wardman, Research Registrar, Department of Respiratory Medicine, The General Infirmary, Leeds
N. J. Cooke, Consultant Physician Department of Respiratory Medicine, The General Infirmary, Leeds
V. Binns, Statistical Assistant, Department of Community Medicine and General Practice, University of Leeds
A. D. Clayden, Senior Lecturer in Medical Statistics Department of Community Medicine and General Practice, University of Leeds
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