John, A. et al. (2021) “A Prospective Cohort Study on Suspected COVID-19 Patients undergoing Nasopharyngeal Swab PCR and HRCT: Nasopharyngeal Swab PCR and HRCT in COVID-19 Patients”, Pakistan BioMedical Journal, 4(1). doi:10.54393/pbmj.v4i1.82.