Funding for this research was provided by:
unicef supply division (43273626)
gavi alliance (CP 8041 07 19 A48)
Received: 21 June 2021
Accepted: 17 September 2021
First Online: 29 September 2021
: Ethics approval was not required as the information used for the analysis was freely available in the public domain. The study did not involve or use human subjects or identifiable personal data. The analysis was implemented with the permission of and in collaboration with the Ministry of Health, and all information was kept anonymous. All authors have read and agreed to its content and are accountable for all aspects of the accuracy and integrity of the manuscript.
: The authors declare that the article is original, has not already been published in another journal, and is not currently under consideration by another journal.
: The authors declare no competing interests.