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3. Koch‐InstitutR.Mund‐Nasen‐Bedeckung im öffentlichen Raum als weitere Komponente zur Reduktion der Übertragungen von COVID‐19. Strategie‐Ergänzung zu empfohlenen Infektionsschutzmaßnahmen und Zielen (3. Update) [Mouth and nose covering in public spaces as a further component to reduce the transmission of COVID‐19. Strategy addition to recommended infection control measures and goals]. Epid Bull [Internet]. 2020;19:3–5. Available from: http://dx.doi.org/10.25646/6731.
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5. World Health Organization United Nations Children’s Fund (UNICEF).Advice on the use of masks for children in the community in the context of COVID‐19: annex to the advice on the use of masks in the context of COVID‐19 21 August 2020. World Health Organization; 2020. [cited 2020 Nov 23]. Available from:https://www.who.int/publications/i/item/WHO‐2019‐nCoV‐IPC_Masks‐Children‐2020.1.