GeroScience, 45, 871-887 GeroScience, 45, 2, pp. 871-887 on behalf of the VITAL consortium 2023, ' Focus group study on perceptions and information needs regarding vaccines targeting the older population : a cross-country comparison in four European countries ', GeroScience, vol. 45, no. 2, pp. 871-887 . https://doi.org/10.1007/s11357-022-00682-5 GeroScience, 45(2), 871-887. Springer International Publishing AG