Ferdous, Most Zannatul, Lakshmi Rani Kundu, Marjia Sultana, and Sheikh Jafia Jafrin. 2021. “Regional Differences in COVID-19 Attack and Case Fatality Rates in the First Quarter of 2020: A Comparative Study”. IMC Journal of Medical Science 14 (2):1-10. https://www.banglajol.info/index.php/IMCJMS/article/view/52825.