@book{2358,
	title = {Preparing countries for COVID-19 vaccine introduction, 21 September 2020},
	publisher = {WHO,},
	year = {2020.},
	address = {Geneva :},
	url = {https://apps.who.int/iris/bitstream/handle/10665/336187/WHO-2019-nCoV-Vaccine_introduction-2020.1-eng.pdf?sequence=1&isAllowed=y}
}