1. Centers for Disease Control and Prevention (CDC). COVID Data Tracker. [Internet]. 2023. Available from: https://covid.cdc.gov/covid-data-tracker.
2. Centers for Disease Control and Prevention (CDC). Underlying Medical Conditions Associated with Higher Risk for Severe COVID-19: Information for Healthcare Professionals [Internet]. COVID-19. [cited 2023 Sep 1]. Available from: https://www.cdc.gov/coronavirus/2019-ncov/hcp/clinical-care/underlyingconditions.html#:∼:text=Based%20on%20data%20from%20the,in%20those%20ages%2075%E2%80%9384.
3. Factors associated with COVID-19-related death using OpenSAFELY;Williamson;Nature,2020
4. Devon Okasako-Schmucker. Brief summary of the association between underlying conditions and severe COVID-19: asthma.
5. COVID-19 risk and outcomes in adult asthmatics treated with biologics or systemic corticosteroids : nationwide real-world evidence;Adir;J Allergy Clin Immunol,2021