1. Worldometer COVID-19 Coronavirus Pandemic
https://www.worldometers.info/coronavirus/?ref=tjournal.ru
2. Summary of Product Characteristics
https://www.ema.europa.eu/documents/product-information/comirnaty-epar-product-information_en.pdf
3. Summary of Product Characteristics
https://www.ema.europa.eu/documents/product-information/covid-19-vaccine-moderna-epar-product-information_en.pdf
4. Summary of Product Characteristics
https://www.ema.europa.eu/documents/product-information/covid-19-vaccine-astrazeneca-epar-product-information_en.pdf
5. Summary of Product Characteristics
https://www.ema.europa.eu/documents/product-information/covid-19-vaccine-janssen-epar-product-information_en.pdf