Sarkar, Manisha, Urmila Dasgupta, Saikat Bhattacharya, Krishna Das Bhattacharyya, and Salil Kumar Bhattacharya. “Status of Oral Polio Vaccination Program for International Travellers and Its Determinants: An Experience from a Designated Centre of West Bengal”. International Journal Of Community Medicine And Public Health 4, no. 4 (March 28, 2017): 1223–1229. Accessed May 28, 2023.