Foto: "<a href="https://ccnull.de/foto/close-up-mask-with-the-inscription-covid-and-christmas-sock-with-snowman/1015148" target="_blank">Close-up, mask with the inscription covid and christmas sock with snowman</a>" von <a href="https://ccnull.de/fotograf/marco-verch" target="_blank">Marco Verch</a> via <a href="https://ccnull.de" target="_blank">ccnull.de</a>, <a href="https://creativecommons.org/licenses/by/2.0/de/" target="_blank">CC-BY 2.0</a>