Funding for this research was provided by:
GlaxoSmithKline Biologicals SA
Received: 18 April 2021
Accepted: 25 November 2021
First Online: 11 December 2021
: This study used epidemiological data aggregated at the country level and therefore did not require an ethics approval.
: Not applicable.
: Lorenzo Argante, Victoria Abbing-Karahagopian, Kumaran Vadivelu and Rino Rappuoli are employed by the GSK group of companies and declare financial and non-financial conflicts of interest. Duccio Medini was employed by the GSK group of companies at the time of the study and declares financial and non-financial conflicts of interest. Kumaran Vadivelu, Rino Rappuoli and Duccio Medini also hold shares in the GSK group of companies.