**Conflict of interest**

Gabutti G received grants from GlaxoSmithKline Biologicals SA, Sanofi Pasteur MSD, Novartis, Crucell/Janssen, Sequirus, Pfizer MSD Italy and Sanofi Pasteur for being consultant or taking part in advisory boards, expert meetings, being a speaker or an organizer of congresses/conferences, and acting as investigator in clinical trials. Gabutti G has no competing interest related to the content of this article. The other authors have no competing interest.

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