1. World Health Organization.Fact sheets. Asthma;2017.https://www.who.int/news-room/fact-sheets/detail/asthma. Accessed August 31 2017.
2. Centers for Disease Control and Prevention.National Center for Health Statistics. FastStats. Asthma;2019.https://www.cdc.gov/nchs/fastats/asthma.htm. Accessed August 31 2019.
3. American Academy of Allergy Asthma & Immunology.Allergic asthma definition;2019.https://www.aaaai.org/conditions-and-treatments/conditions-dictionary/allergic-asthma. Accessed December 1 2019.
4. Breastfeeding, Childhood Asthma, and Allergic Disease
5. Clinical practice