Fig. 2

Data selection and preparation process. In case a person registered twice with the same email address, the datasets were synthesised. If one email address was used by several persons, datasets were considered separately. Batch numbers were checked for plausibility. Surveys regarding vaccinations with invalid batch numbers were set to missing. Invalid was defined as a number not known or an incorrect combination of number and vaccine. *If the follow-up survey has been sent 40 days after the second vaccination, this survey represents the second long-term as well as the follow-up survey, as they did not receive a separate long-term survey