Methods
A systematic search was carried out in 4 electronic databases: EMBASE, MEDLINE, MedRxiv, and Scopus to assess the relationship between asthma and COVID-10 using studies in English language available up to 2020 May 14th. The search terms included were “COVID-19” OR “SARS-CoV-2“ OR “Coronavirus“ AND “Asthma” OR “Allergy” OR “Case series” OR “Comorbidities” OR “Epidemiology” OR “Hospitalization” OR “Risk factors”. Additionally, the references of the initial included studies were hand-searched to identify other possibly eligible studies.