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. 2022 Feb 26;148(6):1363–1374. doi: 10.1007/s00432-022-03961-y

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Fig. 4 — Percentage of sources used to obtain information on the COVID-19 vaccines¹. WHO World Health Organization, PEI Paul-Ehrlich-Institut, RKI Robert-Koch-Institut, ¹the possibility of multiple answers was given