Kahn AL, Steffen CA, Henaff L, MacDonald NE, et al. COVID-19 vaccine policy development in a sample of 44 countries - Key findings
from a December 2021 survey of National Immunization Technical Advisory Groups
(NITAGs). Vaccine 2022 Nov 17:S0264-410X(22)01427-X. doi: 10.1016/j.vaccine.2022.
PMID: 36494252