Received: 27 June 2020
Accepted: 9 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: This study used secondary data of the Inactivated Polio Vaccine (IPV) campaign which was collected by the Emergency Operations Centre (EOC) for Polio Eradication and Immunization, Health department, Sindh Government, Pakistan. Approval has been obtained from the ERB of Health Department Government of Sindh, Pakistan; before the acquisition of IPV campaign data of EOC Sindh for this study.
: Not applicable.
: The author (s) declares that they have no competing interests.