Received: 18 November 2019
Accepted: 17 August 2020
First Online: 28 August 2020
Ethics approval and consent to participate
: The current study is based on published data. Ethics approval and consent to participate are not applicable.
: Not applicable.
: X-H Zhang is employee of the GSK group of companies and holds shares in the GSK group of companies as part of her employee remuneration. CY Lu reports personal fees from the GSK group of companies and Pfizer, outside the submitted work. N-C Chiu reports grants from the Taiwanese CDC, Sanofi Pasteur, Novartis, Medigen, and the GSK group of companies, outside the submitted work. E Kruger and S-C Tan report that their organization received fees from the GSK group of companies for the conduct of the study and the development of the related publications, and outside of the submitted work. Other authors declare no conflict of interest.