Mushtaq, S., Din, N., Shah, A., Riaz, O., Azam, K. and Khan, S. (2022) “Association of Time-Lines of COVID-19 Seropositivity with Antibody Ratio Levels”, Pakistan Armed Forces Medical Journal (PAFMJ), 72(3), pp. 1023-26. doi: 10.51253/pafmj.v72i3.7173.