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. 2021 Oct 9;57(10):1077. doi: 10.3390/medicina57101077

Table 1.

Main characteristics of COVID passes.

(1)
Digital and/or paper based
(2)
QR code
(3)
Free of charge
(4)
In the national language of issuing country and English
(5)
Safe and forgery-proof
(6)
Acknowledged as valid in all EU member states