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J. C. Wagner, Pneumoconiosis Research Unit, Llandough Hospital, Penarth, Glamorgan
J. N. McCormick, Oxford Regional Rheumatic Diseases Research Centre, Stoke Mandeville Hospital, Aylesbury
J. C. Wagner, Pneumoconiosis Research Unit, Llandough Hospital, Penarth, Glamorgan
J. N. McCormick, Oxford Regional Rheumatic Diseases Research Centre, Stoke Mandeville Hospital, Aylesbury