John, A., F. Ha, and M. Zumwalt. ‚ÄúSusceptibility/Manifestations of Different Age Groups With Various Comorbidities to COVID-19 Infection‚ÄĚ. The Southwest Respiratory and Critical Care Chronicles, Vol. 8, no. 35, July 2020, pp. 7-16, doi:10.12746/swrccc.v8i35.731.