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  1. International ERS/ATS Guidelines on Definition, Evaluation, and Treatment of Severe Asthma. American Thoracic Society. https://www.thoracic.org/statements/resources/allergy-asthma/Severe-Asthma-CPG-ERJ.pdf
  2. Difficult to Control Asthma. Asthma.org.uk. https://www.asthma.org.uk/advice/understanding-asthma/types/difficult-control-asthma/
  3. Severe Asthma. Asthma.org.uk. https://www.asthma.org.uk/advice/severe-asthma/
  4. Eosinophilic Asthma. American Partnership for Eosinophilic Disorders. http://apfed.org/about-ead/eosinophilic-asthma/
  5. Asthma Types. National Jewish Health. https://www.nationaljewish.org/conditions/asthma/overview/types
  6. Asthma Treatment. Asthma and Allergy Foundation of America. http://www.aafa.org/page/asthma-treatment.aspx
  7. Diagnosis and Management of Eosinophilic Asthma: A U.S. Perspective. National Center for Biotechnology Information. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3990389/
  8. Biomarkers in the Management of Difficult Asthma. National Center for Biotechnology Informationhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4997932/
  9. Severe Asthma Phenotypes. UpToDate.com. http://www.uptodate.com/contents/severe-asthma-phenotypes