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This file has been used in: Stefan Laurin (2020-12-28). Der Ruhrpilot (in de). ruhrbarone.de / Stefan Laurin. Retrieved on 2020-12-28. web.archives.org

This file has been used in: Impfquoten-Ranking der Bundesländer: NRW weiter auf Platz 8! (in de). ruhrbarone.de / Stefan Laurin (2021-01-05). Retrieved on 2021-01-05. web.archives.org

This file has been used in: Der Ruhrpilot (in de). ruhrbarone.de / Stefan Laurin (2022-12-31). Retrieved on 2023-11-11. web.archives.org