Shanem, J. , Sikander Ghayas Khan, M. , Azzam Khan, M. , Firdous, A., Hameed Sial, S., Asmat, A. , Majid, S. , Khan, S. and Anwar Faridi, T. 2022. Frequency of Voice Changes during Covid-19 Infections: A Retrospective Study: Frequency of Voice Changes during Covid-19 Infections: A Retrospective Study. Pakistan BioMedical Journal. 5, 6 (Jun. 2022), 80–84. DOI:https://doi.org/10.54393/pbmj.v5i6.525.