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Research letter
Dynamic laryngeal narrowing in COPD may have effects on the trachea
  1. G S Haji1,2,
  2. M I Polkey1,2,
  3. J H Hull1,2
  1. 1Department of Respiratory Medicine, Royal Brompton Hospital, London, UK
  2. 2NIHR Respiratory Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust and Imperial College, London, UK
  1. Correspondence to Dr J H Hull, NIHR Respiratory Biomedical Research Unit, Royal Brompton & Harefield NHS Foundation Trust, London SW3 6HP, UK; j.hull{at}rbht.nhs.uk

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We thank Leong and colleagues for their comments regarding our manuscript1 and for highlighting the role of the central airways in modulating pressure and airflow in patients with a label of ‘obstructive airways disease’.2 We agree that a functional role of the glottis may indeed be to regulate and interact with excessive …

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