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Tay, T. R., Radhakrishna, N., Hore‐Lacy, F., Smith, C., Hoy, R., Dabscheck, E., & Hew, M. (2016). comorbidities in difficult asthma are independent risk factors for frequent exacerbations, poor control and diminished quality of life. Respirology, 21(8), 1384–1390. http://access.bl.uk/ark:/81055/vdc_100038571837.0x000014