Zeller, B., E. M. Kulik, N. U. Zitzmann, and T. Waltimo. “Awareness of Vaccine-Preventable Diseases and Self-Reported Immune Status of Swiss Dental Healthcare Workers”. Swiss Medical Weekly, vol. 151, no. 3940, Sept. 2021, p. w30036, doi:10.4414/SMW.2021.w30036.