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We read with great interest the article by Tan et al,1 whereby they have discussed the occurrence of exacerbation-like events in patients without COPD. The basic concept of the study needs debate and clarification.
The authors have used the terms ‘non-COPD patients’ and ‘exacerbation like event’ to mention the group of patients who didn't fulfil the spirometric criteria for COPD. Without mentioning its causes, this non-COPD group with chronic respiratory symptoms …
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