Zürcher, Kathrin, Marcel Zwahlen, Claudia Berlin, Matthias Egger, and Lukas Fenner. “Trends in Influenza Vaccination Uptake in Switzerland: Swiss Health Survey 2007 and 2012”. Swiss Medical Weekly 149, no. 0304 (January 23, 2019): w14705. Accessed July 12, 2024. https://smw.ch/index.php/smw/article/view/2570.