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2. Early impact of the coronavirus disease (COVID-19) pandemic and physical distancing measures on routine childhood vaccinations in England, January to April 2020;McDonald;Euro Surveill,2020
3. Decline in child vaccination coverage during the COVID-19 pandemic-Michigan Care Improvement Registry, May 2016–May 2020;Bramer;MMWR Early Release,2020
4. Statement of the German standing committee on vaccination: carrying out recommended vaccinations during the COVID-19 pandemic. Epid Bull 2020;18:3–4. doi: 10.25646/6858 [in German].
5. Federal Institution for Prevention and Health Promotion: European Immunization Week 2020. Keep an eye on the recommended vaccinations even in times of Corona, 2020 [cited 2020 Apr 21]. Available from: https://www.impfen-info.de/aktuelles/artikel/europaeische-impfwoche-2020.html.