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Comorbidity in severe asthma requiring systemic corticosteroid therapy: cross-sectional data from the Optimum Patient Care Research Database and the British Thoracic Difficult Asthma Registry
  1. Joan Sweeney1,
  2. Chris C Patterson2,
  3. Andrew Menzies-Gow3,
  4. Rob M Niven4,
  5. Adel H Mansur5,
  6. Christine Bucknall6,
  7. Rekha Chaudhuri7,
  8. David Price8,
  9. Chris E Brightling9,
  10. Liam G Heaney1
  11. on behalf of the British Thoracic Society Difficult Asthma Network
  1. 1Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
  2. 2Centre for Public Health, Queen's University of Belfast, Belfast, UK
  3. 3Royal Brompton Hospital, London, UK
  4. 4MAHSC, The University of Manchester & UHSM, Manchester, UK
  5. 5Severe and Brittle Asthma Unit, Birmingham Heartlands Hospital, Birmingham, UK
  6. 6Department of Respiratory Medicine, Royal Infirmary, Glasgow, UK
  7. 7Division of Immunology, Infection and Inflammation, Department of Respiratory Medicine, University of Glasgow and Gartnavel General, Glasgow, UK
  8. 8Academic Primary Care, University of Aberdeen, Aberdeen, UK
  9. 9Department of Infection, Inflammation and Immunity, Institute for Lung Health, University of Leicester, Leicester, UK
  1. Correspondence to Professor Liam G Heaney, Centre for Infection and Immunity, Queen's University of Belfast, Wellcome-Wolfson Institute for Experimental Medicine, 97 Lisburn Road, Belfast BT9 7BL, UK; jsweeney13{at}

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