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Summary:Research. [(BNI unique abstract)] 5 references
Bibliography:ObjectType-Article-1
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Correspondence to: Dr H J Milburn, Chest Clinic, Guy’s Hospital, London SE1 9RT
Contributors: All the authors participated in designing the study. NB prepared the questionnaire, interviewed patients, and collected the data. GMC critically revised the manuscript. HJM analysed the data, wrote the paper, and had the original idea for the study and is guarantor for the study.
ISSN:0959-8138
1756-1833
1468-5833
DOI:10.1136/bmj.317.7162.856