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. 2023 Aug 7;13(8):e069858. doi: 10.1136/bmjopen-2022-069858

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© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Schematic presentation of Self-Controlled Case Series method for hypothetical subjects included in the study. (A) Events occurring in vaccinated subjects during the risk period. (B) Events occurring in the reference period after vaccination. (C) Events occurring in the reference period before vaccination. (D) Events occurring in unvaccinated subjects.