Adhikari, U. R., S. Gupta, and S. Bhattacharjee. “COVID-19 Infection Among Nursing Personnel: A Retrospective Survey in Kolkata, West Bengal”. International Journal Of Community Medicine And Public Health, vol. 9, no. 6, May 2022, pp. 2684-90, doi:10.18203/2394-6040.ijcmph20221553.