Areeb Amjad, Asfar Anwar, Shujaat Ali, Farah Waseem, Hadia Khan, Mariyah Hidayat 2023. The Challenges for Implementation of Policies Causing A Delay in Mass Immunization Against Covid-19: A Cross Sectional Qualitative Study. Pakistan Journal of Medical & Health Sciences. 16, 11 (Jan. 2023), 320. DOI:https://doi.org/10.53350/pjmhs20221611320.