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
Joan Sweeney, Chris C Patterson, Andrew Menzies-Gow, Rob M Niven, Adel H Mansur, Christine Bucknall, Rekha Chaudhuri, David Price, Chris E Brightling, Liam G Heaney
Thorax Apr 2016, 71 (4) 339-346; DOI: 10.1136/thoraxjnl-2015-207630