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This file has been used in: Gesundheitsamt der Stadt Köln (in de). CURA Köln. Retrieved on 2010-12-18.

This file has been used in: Beratung zu Gesundheitsfragen für Seniorinnen und Senioren (in de). CURA Köln. Retrieved on 2010-12-18.

This file has been used in: Stefan Laurin (2020-08-09). Der Ruhrpilot (in de). ruhrbarone.de / Stefan Laurin. Retrieved on 2020-12-27. web.archive.org

This file has been used in: Stefan Laurin (2022-01-22). Der Ruhrpilot (in de). ruhrbarone.de / Stefan Laurin. Retrieved on 2022-01-25. web.archive.org